CN113132583A - Optical lens, camera module and terminal - Google Patents

Optical lens, camera module and terminal Download PDF

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Publication number
CN113132583A
CN113132583A CN201911425862.8A CN201911425862A CN113132583A CN 113132583 A CN113132583 A CN 113132583A CN 201911425862 A CN201911425862 A CN 201911425862A CN 113132583 A CN113132583 A CN 113132583A
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CN
China
Prior art keywords
lens
optical lens
image
optical
rotationally symmetric
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Granted
Application number
CN201911425862.8A
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Chinese (zh)
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CN113132583B (en
Inventor
江依达
于晓丹
王海燕
叶海水
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lenses (AREA)

Abstract

The application provides an optical lens, a camera module and a terminal. At least one non-rotation symmetrical lens is arranged in the lens of the optical lens for imaging, and the non-rotation symmetrical lens can be used for correcting the distortion of the optical lens, so that better imaging is obtained. And because the object side surface and/or the image side surface of the non-rotational symmetric lens are free-form surfaces, namely the object side surface and/or the image side surface of the non-rotational symmetric lens can have higher design freedom, the non-rotational symmetric lens can be designed more flexibly according to actual requirements, so that a better distortion correction effect is realized, and the imaging quality of the optical lens is improved.

Description

Optical lens, camera module and terminal
Technical Field
The embodiment of the application relates to the field of lenses, in particular to an optical lens, a camera module and a terminal.
Background
As the application of the photographing apparatus becomes more and more popular, the demand for the imaging lens of the photographing apparatus becomes higher and higher. For example, an imaging lens is required to be capable of realizing a wide field of view. The current wide-angle lens or ultra-wide-angle lens can meet the requirement of large-field imaging. However, the larger the angle of field of view of the imaging lens, the more severe the distortion of the captured image is generally.
Currently, to solve the distortion problem, the distortion is generally reduced by algorithm clipping or algorithm compensation. However, the distortion is weakened through an algorithm cutting mode, and meanwhile, the field of view shot by the lens is also reduced, so that the significance of a wide-angle lens or an ultra-wide-angle lens is lost; the distortion compensation mode through the algorithm has the risk of losing analytic power, and system resources need to be consumed to realize real-time correction in a video application scene or a photographing preview mode, so that the power consumption, the heat dissipation and the processing speed of equipment are greatly challenged.
Disclosure of Invention
The embodiment of the application provides an optical lens, a camera module comprising the optical lens and a terminal comprising the camera module, wherein the optical lens can enable an image obtained by shooting to have smaller distortion. Moreover, the small distortion is realized, the visual angle of the optical lens is not influenced, and the system resource of the terminal is not consumed.
In a first aspect, an optical lens is provided. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side, wherein the first lens, the third lens and the fifth lens all have negative focal power, and the second lens and the fourth lens all have positive focal power; each of the first to fifth lenses includes an object-side surface facing the object side and an image-side surface facing the image side, the first to fifth lenses include at least one non-rotationally symmetric lens, the object-side surface and/or the image-side surface of the non-rotationally symmetric lens are free-form surfaces, and the optical lens satisfies the following relations:
the absolute TDT is less than or equal to 3.0 percent; where TDT is the maximum value of TV distortion in the imaging range of the optical lens.
In the present embodiment, the lens is taken as a boundary, a side where a subject is located is an object side, and a surface of the lens facing the object side may be referred to as an object side; the side of the lens where the image of the object is located is the image side, and the surface of the lens facing the image side may be referred to as the image side surface.
In the embodiment of the application, at least one non-rotation symmetrical lens is arranged in the lens of the optical lens for imaging, and the non-rotation symmetrical lens can be used for correcting the distortion of the optical lens, so that better imaging is obtained. And because the object side surface and/or the image side surface of the non-rotationally symmetric lens are/is a free-form surface, and the free-form surface is a non-rotationally symmetric aspheric surface, namely the object side surface and/or the image side surface of the non-rotationally symmetric lens can have higher design freedom, the non-rotationally symmetric lens can be designed more flexibly according to actual requirements, so that better distortion correction effect is realized, and the imaging quality of the optical lens is improved.
In some embodiments, the fourth lens is a positive meniscus lens and the fifth lens is a negative meniscus lens. The fourth lens element 114 is a negative meniscus structure, the fifth lens element 115 is a negative meniscus structure, and the combination of the fourth lens element 114 and the fifth lens element 115 can reduce the aberration generated by the optical lens assembly 10.
In some embodiments, the fourth lens satisfies the following relationship:
0 < R8/R7< 1; wherein R7 is the radius of curvature of the object-side surface of the fourth lens, and R8 is the radius of curvature of the image-side surface of the fourth lens. The bending curvature of the object side paraxial position of the fourth lens is larger than that of the image side paraxial position, so that the fourth lens can form a positive meniscus structure.
In some embodiments, the fifth lens satisfies the following relationship:
R9/R10 is more than 1 and less than or equal to 3.5; wherein, R9 is the curvature radius of the object side surface of the fifth lens, and R10 is the curvature radius of the image side surface of the fifth lens. The bending curvature of the object side paraxial position of the fifth lens is larger than that of the image side paraxial position, so that the fifth lens can form a negative meniscus structure. And R9/R10 is less than 3.5, the divergence effect of the fifth lens on the light can be controlled within a certain range, so that the light is transmitted to the photosensitive element as much as possible, and a better imaging effect is realized.
In some embodiments, the optical lens satisfies the following relationship:
FOV is more than or equal to 100 degrees and less than or equal to 130 degrees; wherein, the FOV is the angle of view of the optical lens. The optical lens has a large field angle and can be used for wide-angle shooting and ultra-wide-angle shooting.
In some embodiments, the third lens satisfies the following relationship:
-5.2. ltoreq. f 3/f. ltoreq.1.5; wherein f3 is the focal length of the third lens; f is the focal length in the sagittal direction of the optical lens. In the embodiment of the application, the ratio of the focal length f3 of the third lens to the focal length f of the optical lens is limited within a certain range, and the focal power borne by the third lens can be reasonably distributed, so that the third lens can be combined with the second lens to achieve a better effect of correcting chromatic aberration.
In some embodiments, the second lens and the fourth lens satisfy the following relationship:
R4/R8 > 0; r4 is the radius of curvature of the image-side surface of the second lens, and R8 is the radius of curvature of the image-side surface of the fourth lens. That is, the radius of curvature R4 of the image-side surface of the second lens is set to be in the same direction as the radius of curvature R8 of the image-side surface of the fourth lens, and thus aberration caused by imaging by the optical lens can be reduced.
In some embodiments, the second lens and the fourth lens satisfy the following relationship:
-0.5 ≦ (R4-R8)/f < 0; wherein R4 is the radius of curvature of the image-side surface of the second lens; r8 is the radius of curvature of the image-side surface of the fourth lens; f is the focal length of the optical lens. In the embodiment of the application, the ratio of the difference between the curvature radius R4 of the image side surface of the second lens and the curvature radius R8 of the image side surface of the fourth lens to the focal length f of the optical lens is limited within a certain range, so that the distortion generated by the imaging of the optical lens can be reduced as much as possible.
In some embodiments, the non-rotationally symmetric lens is near the image side of the optical lens relative to the other lenses of the optical lens; alternatively, the non-rotationally symmetric optic is near the object side of the optical lens relative to the other optics of the optical lens.
When the lens is closer to the image side of the optical lens, the work of adjusting the optical path is more important, and when the lens close to the image side of the optical lens is set as the non-rotation symmetrical lens, the non-rotation symmetrical lens can correct the aberration generated by other lenses on the image side of the lens, so that better correction effect of the aberration and the distortion is realized, and high-quality imaging is obtained.
The light enters from the lens close to the object side of the optical lens, and when the lens close to the object side of the optical lens is set as the non-rotationally symmetrical lens, the problem of obvious distortion caused by a large field of view can be corrected when the light reflected by a scene to be imaged enters from the lens close to the object side, and the correction effect can be achieved more easily.
In some embodiments, the object-side surface of the non-rotationally symmetric lens is symmetric about a first plane of symmetry, and the object-side surface of the non-rotationally symmetric lens is symmetric about a second plane of symmetry, the first plane of symmetry being perpendicular to the second plane of symmetry.
In some embodiments, the image side surface of the non-rotationally symmetric lens is symmetric with respect to the first plane of symmetry, and the image side surface of the non-rotationally symmetric lens is symmetric with respect to the second plane of symmetry.
When the other lens on the object side of the non-rotationally symmetric lens in the optical lens is generally a rotationally symmetric lens, the aberration, distortion, and the like generated when the light passes through the rotationally symmetric lens are generally symmetric. In some embodiments of the present application, when the non-rotationally symmetric lens is disposed close to the image side of the optical lens, since the object-side surface and the image-side surface of the non-rotationally symmetric lens are symmetric with respect to the first symmetric surface and the second symmetric surface, respectively, a better distortion correction effect can be achieved. Meanwhile, since the object side surface and the image side surface of the non-rotationally symmetric lens are symmetric about the first symmetric surface and the second symmetric surface respectively, the processing technology of the object side surface of the non-rotationally symmetric lens can be simpler.
In a second aspect, the present application provides a camera module. The camera module comprises a photosensitive element and an optical lens, the photosensitive element is positioned on the image side of the optical lens, and light rays are projected to the photosensitive element after passing through the optical lens.
The optical image obtained after passing through the optical lens is converted into an electric signal through the photosensitive element, and then subsequent steps such as image processing and the like are carried out, so that an image with good imaging quality can be obtained. Moreover, the optical lens corrects the imaging distortion, and can obtain better imaging quality. Consequently, the camera module of this application also can realize good formation of image quality.
In some embodiments, the non-rotationally symmetric optic of the optical lens is symmetric with respect to a first plane of symmetry, and the object-side surface of the non-rotationally symmetric optic is symmetric with respect to a second plane of symmetry, the first plane of symmetry being perpendicular to the second plane of symmetry.
In some embodiments, the image side surface of the non-rotationally symmetric lens is symmetric with respect to the first plane of symmetry, and the image side surface of the non-rotationally symmetric lens is symmetric with respect to the second plane of symmetry.
In some embodiments, the photosensitive element is rectangular and includes a first side and a second side perpendicular to each other, the first side being parallel to the first plane of symmetry and the second side being parallel to the second plane of symmetry.
The symmetry characteristic of the non-rotational symmetry lens of this application embodiment matches with the symmetry characteristic of photosensitive element to the better distortion that produces the formation of image visual field of camera module is corrected, in order to obtain better imaging quality.
In a third aspect, a terminal is provided, where the terminal includes an image processor and a camera module, the image processor is in communication connection with the camera module, the camera module is configured to obtain image data and input the image data into the image processor, and the image processor is configured to process the image data output therefrom.
In the application, the image data of the camera module is processed through the image processor so as to obtain better shot pictures or images. Moreover, the optical lens corrects the distortion generated by imaging, and better imaging quality can be obtained. Therefore, the terminal of the application can shoot images with good imaging quality.
Drawings
Fig. 1 is a schematic structural diagram of a terminal according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a terminal according to another embodiment of the present application.
Fig. 3 is a schematic view of the imaging principle of the terminal shown in fig. 2.
Fig. 4 is a schematic structural diagram of a camera module according to some embodiments of the present application.
FIG. 5 is a schematic plan view of a non-rotationally symmetric lens of the present application.
Fig. 6 is a schematic cross-sectional view of the non-rotationally symmetric lens of fig. 5 along direction a-a.
Fig. 7 is a schematic cross-sectional view of the non-rotationally symmetric lens of fig. 5 taken along the direction B-B.
Fig. 8 is a schematic cross-sectional view of an optical lens of the first embodiment of the present application.
Fig. 9 is an imaging simulation diagram of the optical lens shown in fig. 8.
Fig. 10 is a schematic cross-sectional view of an optical lens according to a second embodiment of the present application.
Fig. 11 is an imaging simulation diagram of the optical lens shown in fig. 10.
Fig. 12 is a schematic cross-sectional view of an optical lens according to a third embodiment of the present application.
Fig. 13 is an imaging simulation diagram of the optical lens shown in fig. 12.
Fig. 14 is a schematic cross-sectional view of a lens of an optical lens according to a fourth embodiment of the present application.
Fig. 15 is an imaging simulation diagram of the optical lens shown in fig. 14.
Fig. 16 is a schematic cross-sectional view of a lens of an optical lens according to a fifth embodiment of the present application.
Fig. 17 is an imaging simulation diagram of the optical lens shown in fig. 16.
Fig. 18 is a schematic cross-sectional view of an optical lens according to a sixth embodiment of the present application.
Fig. 19 is an imaging simulation diagram of the optical lens shown in fig. 18.
Fig. 20 is a schematic cross-sectional view of an optical lens according to a seventh embodiment of the present application.
Fig. 21 is an imaging simulation diagram of the optical lens shown in fig. 20.
Fig. 22 is a schematic cross-sectional view of a lens of an optical lens according to an eighth embodiment of the present application.
Fig. 23 is an imaging simulation diagram of the optical lens shown in fig. 22.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
For convenience of understanding, technical terms related to the present application are explained and described below.
Focal length (f), also called focal length, is a measure of the concentration or divergence of light in an optical system, and refers to the vertical distance from the optical center of a lens or lens group to the focal plane when an infinite scene is formed into a sharp image on the focal plane through the lens or lens group.
The diaphragm is a device for controlling the amount of light that is transmitted through the lens and applied to the photosensitive element. The expression aperture size is expressed in terms of F number/F value.
The F-number is a relative value (reciprocal of relative aperture) obtained by the focal length of the lens/the lens light-passing diameter. The smaller the F value of the aperture, the more the amount of light entering the same unit time.
Positive power, also known as positive refractive power, indicates that the lens has a positive focal length and has the effect of converging light.
Negative optical power, which may also be referred to as negative refractive power, indicates that the lens has a negative focal length and has a divergent light effect.
Total Track Length (TTL) refers to the total length from the end of the optical lens away from the imaging surface to the imaging surface.
The abbe number, i.e. the dispersion coefficient, is the ratio of the difference of refractive indexes of the optical material at different wavelengths, and represents the dispersion degree of the material.
The optical axis is a ray that passes perpendicularly through the center of the ideal lens. When light rays parallel to the optical axis are incident on the convex lens, the ideal convex lens is that all the light rays converge at a point behind the lens, and the point where all the light rays converge is the focal point.
The object side is defined by the lens, and the side of the object to be imaged is the object side.
And the image side is the side where the image of the object to be imaged is positioned by taking the lens as a boundary.
The object side surface, the surface of the lens near the object side is called the object side surface.
The surface of the lens near the image side is called the image side surface.
Optical distortion (optical distortion) refers to the difference between the point display positions in distorted images and their positions in an ideal system, focusing on the position shift of points in an actual imaging system in a microscopic view.
TV distortion (TV distortion) is the relative distortion, i.e. the degree of distortion of the actual image.
The application provides a terminal which can be a mobile phone, a tablet, a computer, a video camera, a camera or other equipment with photographing or shooting functions. Referring to fig. 1, fig. 1 is a schematic structural diagram of a terminal 1000 according to an embodiment of the present application. In this embodiment, terminal 1000 is a mobile phone. In other embodiments, terminal 1000 can be a device with an imaging function in other forms, such as a tablet or a camera.
The terminal 1000 includes a camera module 100 and an image processor 200 communicatively coupled to the camera module 100. The camera module 100 is used for acquiring image data and inputting the image data into the image processor 200, so that the image processor 200 processes the image data. The communication connection between the camera module 100 and the image processor 200 may include data transmission through electrical connection such as wire connection, or may also be realized through other data transmission modes such as optical cable connection or wireless transmission.
The function of the image processor 200 is to optimize the digital image signal through a series of complex mathematical algorithm operations, and finally to transmit the processed signal to a display or store the processed signal in a memory. The image processor 200 may be an image processing chip or a Digital Signal Processing (DSP) chip.
In the embodiment shown in fig. 1, camera module 100 is disposed on the back surface of terminal 1000, and is a rear camera of terminal 1000. It is understood that in some embodiments, camera module 100 can also be disposed on a front face of terminal 1000 as a front-facing camera of terminal 1000. The front camera and the rear camera can be used for self-shooting and can also be used for shooting other objects by a photographer.
In some embodiments, there are a plurality of camera modules 100, and the plurality means two or more. The plurality of camera modules 100 can cooperate with each other, thereby achieving a better shooting effect. In the embodiment shown in fig. 2, there are two rear cameras of the terminal 1000, and the two camera modules 100 are both in communication connection with the image processor 200, so as to process the image data of the two camera modules 100 through the image processor 200, so as to obtain better shot pictures or images.
It should be understood that the installation position of the camera module 100 of the terminal 1000 in the embodiment shown in fig. 1 is only illustrative, and in some other embodiments, the camera module 100 can be installed in other positions on the mobile phone. For example, the camera module 100 can be installed in the middle of the upper part of the back of the mobile phone or in the upper right corner; alternatively, the camera module 100 may be disposed not on the main body of the mobile phone, but on a component that is movable or rotatable with respect to the mobile phone, for example, the component may be extended, retracted, or rotated from the main body of the mobile phone. The present application does not limit the installation position of the camera module 100.
Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of a terminal according to another embodiment of the present application, and fig. 3 is a schematic imaging principle diagram of the terminal shown in fig. 2. In some embodiments, terminal 1000 can further include an analog-to-digital converter (also referred to as A/D converter) 300. The adc 300 is connected between the camera module 100 and the image processor 200. The analog-to-digital converter 300 is configured to convert an analog image signal generated by the camera module 100 into a digital image signal and transmit the digital image signal to the image processor 200, and then the image processor 200 processes the digital image signal, and finally displays an image or an image on a display screen or a display.
In some embodiments, the terminal 1000 further includes a memory 400, the memory 400 is in communication with the image processor 200, and the image processor 200 processes the digital image signal and then transmits the processed image to the memory 400, so that the image can be searched from the memory and displayed on the display screen at any time when the image needs to be viewed later. In some embodiments, the image processor 200 further compresses the processed image digital signal and stores the compressed image digital signal in the memory 400, so as to save the space of the memory 400. It should be noted that fig. 3 is only a schematic structural diagram of the embodiment of the present application, and the position structures of the camera module 100, the image processor 200, the analog-to-digital converter 300, the memory 400, and the like shown in the diagram are only schematic.
Referring to fig. 3, the camera module 100 includes an optical lens 10 and a photosensitive element 20. The light sensing element 20 is located on the image side of the optical lens 10. The image side of the optical lens 10 refers to a side of the optical lens 10 close to an image of a subject to be imaged. When the camera module 100 is in operation, a subject to be imaged passes through the optical lens 10 and then is imaged on the photosensitive element 20. Specifically, the working principle of the camera module 100 is as follows: the light L reflected by the subject to be imaged generates an optical image through the optical lens 10 and projects onto the surface of the photosensitive element 20, and the photosensitive element 20 converts the optical image into an electrical signal, i.e., an analog image signal S1 and transmits the converted analog image signal S1 to the analog-to-digital converter 300, so as to be converted into a digital image signal S2 by the analog-to-digital converter 300 and then to the image processor 200. The ray arrows in fig. 3 are merely schematic and do not represent actual ray angles.
The photosensitive element 20 is a semiconductor chip, and includes several hundreds of thousands to several millions of photodiodes on the surface thereof, and generates electric charges when being irradiated by light, thereby completing the conversion of optical signals into electrical signals. Alternatively, the light sensing element 20 may be any device capable of converting an optical signal into an electrical signal. For example, the photosensitive element 20 may be a Charge Coupled Device (CCD) or a complementary metal-oxide semiconductor (CMOS).
The optical lens 10 affects the imaging quality and the imaging effect. The optical lens 10 includes a plurality of lenses 11 arranged from the object side to the image side, and performs imaging mainly by using the refraction principle of the lenses 11. Specifically, light of an object to be imaged forms a sharp image on a focal plane through the optical lens 10, and an image of a subject is recorded through the photosensitive element 20 located on the focal plane. The adjacent lenses 11 may have an air space therebetween or may be disposed in close contact therewith. The primary function of each lens 11 is different, and the best imaging quality is obtained by cooperation between different lenses 11.
In some embodiments, the optical lens 10 further includes a diaphragm 12, and the diaphragm 12 may be disposed on the object side of the plurality of lenses 11, or between lenses close to the object side of the plurality of lenses 11. For example, the diaphragm 12 may be located between a first lens and a second lens close to the object side, or between a second lens and a third lens close to the object side in the plurality of lenses 11. The diaphragm 12 may be an aperture diaphragm for limiting the amount of light entering to change the brightness of the image.
In some embodiments, the optical lens 10 further includes an infrared filter 30, and the infrared filter 30 is located between the photosensitive element 20 and the lens 11 of the optical lens 10. The light refracted by each lens 11 of the optical lens 10 is irradiated onto the infrared filter 30, and is transmitted to the photosensitive element 20 through the infrared filter 30. The infrared filter 30 can filter out unnecessary light projected onto the photosensitive element 20, and prevent the photosensitive element 20 from generating false colors or moire, so as to improve the effective resolution and color reproducibility thereof.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a camera module 100 according to some embodiments of the present disclosure. In some embodiments, the optical lens 10 further includes a lens barrel 10a, the plurality of lenses 11 of the optical lens 10 are fixed in the lens barrel 10a, and the plurality of lenses 11 fixed in the lens barrel 10a are coaxially disposed. In the present embodiment, the plurality of lenses 11 are fixed in the lens barrel 10a, the distance between the lenses 11 is fixed, and the optical lens 10 is a lens with a fixed focal length. In some other embodiments of the present application, the plurality of lenses 11 of the optical lens 10 can move relatively in the lens barrel 10a to change the distance between the plurality of lenses 11, so as to change the focal length of the optical lens 10, thereby achieving focusing of the optical lens 10. The infrared filter 30 may be fixed to an end of the lens barrel 10a of the optical lens 10 facing the image side.
The camera module 100 further includes a fixing base (holder)50, a circuit board 60, and the like.
The fixing base 50 includes an accommodating cavity, the optical lens 10 is accommodated in the accommodating cavity of the fixing base 50 and fixed to the cavity wall of the accommodating cavity, and the optical lens 10 is fixed relative to the fixing base 50 and cannot move relative to the fixing base 50. The circuit board 60 is fixed to a side of the fixing base 50 facing away from the optical lens 10. The wiring board 60 is used to transmit electrical signals. The circuit board 60 may be a Flexible Printed Circuit (FPC) or a Printed Circuit Board (PCB), wherein the FPC may be a single-sided flexible board, a double-sided flexible board, a multi-layer flexible board, a rigid flexible board, a hybrid-structured flexible circuit board, or the like. Other components included in the camera module 100 are not described in detail herein. The infrared filter 30 may be fixed to the cavity wall of the fixing base 50 and located between the optical lens 10 and the circuit board 60; alternatively, the support may be supported and fixed above the circuit board 60.
The photosensitive element 20 is fixed to the circuit board 60 by bonding or mounting. The light receiving element 20 is located on the image side of the optical lens 10 and is disposed opposite to the optical lens 10, and an optical image generated by the optical lens 10 can be projected onto the light receiving element 20. In some embodiments, the analog-to-digital converter 300, the image processor 200, the memory 400, etc. are also integrated on the circuit board 60 by means of bonding or mounting, etc., so that the communication connection between the photosensitive element 20, the analog-to-digital converter 300, the image processor 200, the memory 400, etc. is realized through the circuit board 60.
In some embodiments, the lens barrel 10a and the fixed base 50 of the optical lens 10 can move relative to the fixed base 50 to change the distance between the optical lens 10 and the photosensitive element 20. When the focal length of the optical lens 10 changes, the lens barrel 10a moves relative to the fixed base 50, so as to adjust the distance between the optical lens 10 and the photosensitive element 20 accordingly, thereby ensuring the imaging quality of the camera module 100. For example, in some embodiments, the fixing base 50 includes a cavity wall of the receiving cavity provided with an internal thread, the outer wall of the lens barrel 10a is provided with an external thread, and the lens barrel 10a is in threaded connection with the fixing base 50. The lens barrel 10a is driven by the driver to rotate, so that the lens barrel 10a moves in the axial direction relative to the fixed base 50, and the lens 11 of the optical lens 10 is close to or far away from the photosensitive element 20. It is understood that the lens barrel 10a may be connected to the fixed base 50 in other manners and may be moved relative to the fixed base 50. For example, the lens barrel 10a and the fixed base 50 are connected by a slide rail.
In the present application, the plurality of lenses 11 of the optical lens 10 includes at least one non-rotationally symmetric lens. The object side surface and/or the image side surface of the non-rotation symmetrical lens are/is a free-form surface. The free-form surface is a non-rotationally symmetric aspheric surface. Wherein, the object side surface and/or the image side surface of the non-rotational symmetric lens are free-form surfaces: the object side surface and the image side surface of the non-rotational symmetric lens can be free-form surfaces; or the object side surface of the non-rotational symmetric lens is a rotationally symmetric spherical surface or a rotationally symmetric aspheric surface, and the image side surface is a free-form surface; or the object side surface of the non-rotational symmetric lens is a free-form surface, and the image side surface of the non-rotational symmetric lens is a rotationally symmetric spherical surface or a rotationally symmetric aspheric surface. In some embodiments of the present application, all of the lenses 11 except the rotationally symmetric lens in the plurality of lenses 11 of the optical lens 10 are rotationally symmetric lenses. The object side surface and the image side surface of the rotational symmetry lens can be both a rotationally symmetric spherical surface or a rotationally symmetric aspheric surface.
In the present application, by providing at least one non-rotationally symmetric lens in the optical lens 10, the non-rotationally symmetric lens can be used to correct distortion generated by imaging of the optical lens 10, thereby obtaining better imaging. When the field of view (FOV) of the optical lens 10 is large and the imaging distortion of the optical lens 10 is severe, a good distortion correction effect can still be achieved by disposing a non-rotationally symmetric lens in the optical lens 10. For example, in some embodiments of the present application, the field angle FOV of the optical lens 10 satisfies: FOV is more than or equal to 100 degrees and less than or equal to 130 degrees, and the maximum value TDT of TV distortion in the imaging range of the optical lens 10 meets the condition that TDT is less than or equal to 3.0 percent. Compared with the traditional optical lens which is a rotational symmetric lens (the maximum value TDT of the TV distortion in the imaging range is generally more than 10 percent), the TV distortion is reduced, and the imaging quality is higher. In addition, since the object side surface and/or the image side surface of the non-rotationally symmetric lens are/is a free-form surface, that is, the object side surface and/or the image side surface of the non-rotationally symmetric lens can have a higher design freedom, the non-rotationally symmetric lens can be designed more flexibly according to actual requirements, so as to achieve a better distortion correction effect and improve the imaging quality of the optical lens 10.
In some embodiments, at least the image-side surface of the non-rotationally symmetric lens is a free-form surface, of the image-side surface and the object-side surface of the non-rotationally symmetric lens. Since the image side surface is closer to the photosensitive element 20, the light rays are more converged at the image side surface than at the object side surface, and when the image side surface is set as the free curved surface, a better correction effect can be achieved than when only the object side surface is set as the free curved surface.
In some embodiments, the non-rotationally symmetric lens is closer to the image side of the optical lens 10 or closer to the object side of the optical lens 10 than other lenses of the optical lens 10. For example, the optical lens 10 includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. When the first lens element is a non-rotationally symmetric lens element and the other lens elements are rotationally symmetric lens elements, the first to fifth lens elements are disposed in order from the object side to the image side, that is, the non-rotationally symmetric lens element is close to the object side of the optical lens 10 relative to the other lens elements; when the fourth lens element and the fifth lens element are non-rotationally symmetric lens elements and the other lens elements are rotationally symmetric lens elements, the first lens element to the fifth lens element are disposed in order from the object side to the image side, i.e., the non-rotationally symmetric lens elements are close to the image side of the optical lens 10 relative to the other lens elements. When the lens 11 closer to the image side of the optical lens 10 is configured as a non-rotationally symmetric lens, the lens 11 closer to the image side of the optical lens 10 is more responsible for adjusting the optical path, and the non-rotationally symmetric lens can correct the aberration generated by the other lens 11 on the image side of the lens, so that better aberration and distortion correction effects can be achieved, and high-quality imaging can be achieved. When the lens 11 close to the object side of the optical lens 10 is set as a non-rotationally symmetric lens, the distortion caused by a large field of view can be corrected when the light reflected by the scenery to be imaged enters from the lens close to the object side, and the correction effect can be achieved more easily.
In the present application, the plurality of lenses 11 of the optical lens 10 are a combination of a rotationally symmetric lens and a non-rotationally symmetric lens. The object side surface and the image side surface of the rotationally symmetric lens can be both rotationally symmetric spherical surfaces or rotationally symmetric aspheric surfaces. The object side surface and/or the image side surface of the non-rotationally symmetric lens are free-form surfaces. In some embodiments of the present application, the object-side surface and the image-side surface of the rotationally symmetric lens of the optical lens 10 are both rotationally symmetric aspheric surfaces. A rotationally symmetrical aspherical surface has a higher degree of freedom, unlike a rotationally symmetrical spherical surface having a constant curvature. Therefore, the present embodiment can design the rotationally symmetric lens of the optical lens 10 according to actual needs, and improve the aberrations at different positions in a targeted manner, thereby improving the imaging quality.
In the embodiment of the application, the free-form surface satisfies the formula:
Figure BDA0002350671530000081
wherein z (x, y) is the optical surface rise; k is a conic coefficient; c is the radius of curvature; r is the height of radius in the direction of the optical axis, wherein r2＝x2+y2；AiIs a polynomial coefficient; eiIs a power series in the x, y directions.
In the embodiment of the application, the rotationally symmetric aspheric surface satisfies the formula:
Figure BDA0002350671530000082
wherein z (x, y) is the optical surface rise; k is a conic coefficient; c is the radius of curvature; r is the radius height in the optical axis direction; r is2＝x2+y2；αiIs a polynomial coefficient; rhoiIs a normalized radial coordinate.
Through the relational expression, the non-rotation symmetrical lens and the rotation symmetrical lens required by the application can be obtained.
In some embodiments of the present application, the object-side surface of the non-rotationally symmetric lens is a free-form surface. The object side surface of the non-rotation symmetrical lens can be symmetrical relative to two symmetrical surfaces which are respectively a first symmetrical surface and a second symmetrical surface, and the first symmetrical surface is vertical to the second symmetrical surface. The object side surface of the non-rotationally symmetric lens is symmetric with respect to the first symmetric surface, and the object side surface of the non-rotationally symmetric lens is symmetric with respect to the second symmetric surface. In some embodiments, the image side surface of the non-rotationally symmetric lens is also a free-form surface. The image side of the non-rotationally symmetric lens is also symmetric with respect to the first plane of symmetry, and the object side of the non-rotationally symmetric lens can also be symmetric with respect to the second plane of symmetry. Specifically, referring to fig. 5, fig. 6 and fig. 7, fig. 5 is a schematic plan view of a non-rotationally symmetric lens according to the present application, fig. 6 is a schematic sectional view of the non-rotationally symmetric lens shown in fig. 5 along a direction a-a, and fig. 7 is a schematic sectional view of the non-rotationally symmetric lens shown in fig. 5 along a direction B-B. Wherein the plane of the section A-A is vertical to the plane of the section B-B, and the optical axis of the non-rotation symmetrical lens is superposed with the intersecting line of the plane of the section A-A and the plane of the section B-B. In this embodiment, a coordinate system is established with the geometric center of the non-rotationally symmetric lens as the origin O, where the Z direction is the optical axis direction of the non-rotationally symmetric lens, the X direction is the sagittal direction of the non-rotationally symmetric lens, and the Y direction is the meridional direction of the non-rotationally symmetric lens. Section B-B lies on the XOZ plane and section A-A lies on the YOZ plane.
As can be seen from FIGS. 6 and 7, the section A-A of the non-rotationally symmetric lens cut along the direction A-A is different from the section B-B of the non-rotationally symmetric lens cut along the direction B-B, and the intersection line A1 of the section A-A and the object-side surface of the non-rotationally symmetric lens is different from the intersection line B1 of the section B-B and the object-side surface of the non-rotationally symmetric lens, i.e. the object-side surface of the non-rotationally symmetric lens cannot be obtained by line rotation; the intersection line a2 where the section a-a intersects the image side surface of the non-rotationally symmetric lens is different from the intersection line B2 where the section B-B intersects the image side surface of the non-rotationally symmetric lens, i.e., the non-rotationally symmetric lens image side surface cannot be obtained by line rotation.
Referring to fig. 6 and 7, the on-axis distance sag11(x) from the intersection point of the object-side surface and the optical axis to the effective radius vertex of the object-side surface of the non-rotationally symmetric lens of the present embodiment is symmetric about the Y-axis, and satisfies: sag11(x) ═ sag11(-x), i.e., the object side of the non-rotationally symmetric lens can be symmetric about the YOZ plane, i.e., the YOZ plane is the first symmetric plane of the non-rotationally symmetric lens. The distance sag11(y) on the axis from the intersection point of the object side surface and the optical axis of the non-rotation symmetrical lens to the effective radius vertex of the object side surface of the non-rotation symmetrical lens is symmetrical about the X axis, and the following requirements are met: sag11(y) ═ sag11(-y), i.e., the object side of the non-rotationally symmetric lens can be symmetric about the XOZ plane, i.e., the XOZ plane is the second symmetric surface of the non-rotationally symmetric lens.
In some embodiments, the on-axis distance sag12(x) from the intersection of the image-side surface of the non-rotationally symmetric optic and the optical axis to the effective radius vertex of the image-side surface of the non-rotationally symmetric optic is symmetric about the Y-axis, satisfying: sag12(x) ═ sag12(-x), i.e., the image side of the non-rotationally symmetric lens can also be symmetric about the first plane of symmetry. And, the on-axis distance sag12(y) from the intersection point of the image side surface of the non-rotationally symmetric lens and the optical axis to the effective radius vertex of the image side surface of the non-rotationally symmetric lens is symmetric about the X axis, satisfying: sag12(y) ═ sag12(-y), i.e., the object-side surface of the non-rotationally symmetric lens can also be symmetric about the second plane of symmetry.
When the other lenses 11 located at the object side of the non-rotationally symmetric lens are rotationally symmetric lenses, the aberration, distortion, etc. generated when the light passes through the rotationally symmetric lenses are generally symmetric. In some embodiments of the present application, when the non-rotationally symmetric lens is disposed close to the image side of the optical lens 10, since the object-side surface and the image-side surface of the non-rotationally symmetric lens are symmetric with respect to the first symmetric surface and the second symmetric surface, respectively, a better distortion correction effect can be achieved. Meanwhile, since the object side surface and the image side surface of the non-rotationally symmetric lens are symmetric about the first symmetric surface and the second symmetric surface respectively, the processing technology of the object side surface of the non-rotationally symmetric lens can be simpler. It is understood that in some other embodiments, the object-side surface or the image-side surface of the non-rotationally symmetric lens may not be symmetric with respect to the first symmetric surface, or the object-side surface or the image-side surface of the non-rotationally symmetric lens may not be symmetric with respect to the second symmetric surface, and parameters of the object-side surface and the image-side surface of the non-rotationally symmetric lens can be designed according to actual aberration, distortion conditions, and the like, so that a better correction effect is achieved, and high-quality imaging is obtained.
In some embodiments of the present disclosure, the photosensitive element 20 is rectangular, and the rectangular photosensitive element 20 includes a first side and a second side perpendicular to each other, wherein the first side is parallel to the first symmetric plane, and the second side is parallel to the second symmetric plane. That is, the symmetry characteristic of the non-rotational symmetry lens of the embodiment of the present application matches with the symmetry characteristic of the photosensitive element 20, so that the distortion generated by the imaging view field of the camera module 100 can be better corrected, and better imaging quality can be obtained.
In some embodiments, the optical lens 10 includes a positive meniscus lens and a negative meniscus lens in the plurality of lenses 11. Wherein, the positive meniscus lens has positive focal power, and the negative meniscus lens has negative focal power. In this embodiment, the pair of lenses 11 are respectively a positive meniscus lens and a negative meniscus lens, and the positive meniscus lens and the negative meniscus lens are combined to reduce the aberration of the optical lens 10, thereby achieving higher imaging quality.
Referring to fig. 3 again, in some embodiments of the present disclosure, the optical lens 10 includes five lenses 11, the five lenses 11 are sequentially arranged from an object side to an image side, and the five lenses 11 are coaxially disposed. The five lenses are, in order from an object side to an image side, a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115. The first lens 111 to the fifth lens 115 are arranged in order from an object side to an image side. In the present application, at least one of the five lenses 11 is non-rotationally symmetric. For example, the first lens 111 may be a non-rotationally symmetric lens, or the fifth lens 115 may be a non-rotationally symmetric lens. The lenses 11 of the present application are all lenses having positive or negative focal power, and when a plane mirror is inserted between the lenses, the plane mirror does not need to be the lens of the optical lens of the present application. For example, when a plane mirror is inserted between the fourth lens 114 and the fifth lens 115, the plane mirror cannot be calculated as the fifth lens according to the embodiment of the present application.
In the present embodiment, the optical lens 10 can obtain high-quality images (with less distortion), and the optical lens 10 includes only five lenses 11, and the number of the lenses 11 is small, so the process is simpler. In addition, since the number of the lenses 10 is small, the total optical length TTL of the optical lens 10 can be small, and the optical lens is more suitable for devices requiring thinning, such as mobile phones and tablets.
In this embodiment, each of the five lenses 11 can bring different optical performances, so that the optical lens 10 with better imaging quality is obtained by combining the lenses with different optical performances. In this embodiment, the first lens 111 has a negative focal power, and the first lens 111 mainly functions to enlarge the field of view; the second lens 112 has positive focal power, and mainly focuses light to reduce light loss, so that light is focused on the photosensitive element 20 as much as possible; the third lens 113 has negative focal power, and the third lens 113 and the second lens 112 cooperate to correct chromatic aberration of the optical lens 10; the fourth lenses 114 each have positive optical power for expanding the light beam, thereby increasing the image height of the image formed on the photosensitive element 20; the fifth lens 115 has negative power, and can further expand the light beam to increase the image height of the image formed on the photosensitive element 20. When one of the first lens 111 to the fifth lens 115 is a non-rotationally symmetric lens, the lens can also correct the distortion. For example, in some embodiments, the fifth lens 115 is a non-rotationally symmetric lens, i.e., the fifth lens 115 not only expands the beam, but also corrects the distortion.
In some embodiments, the focal length f3 of the third lens 113 and the focal length f of the optical lens 10 satisfy: f3/f is more than-5.2 and less than or equal to 1.5. By limiting the range of the ratio of the focal length f3 of the third lens 113 to the focal length f of the optical lens 10, the optical power borne by the third lens 113 can be reasonably distributed, so that the third lens 113 can be combined with the second lens 112 to better correct the chromatic aberration.
The fourth lens 114 is a positive meniscus lens and the fifth lens 15 is a negative meniscus lens. The object-side paraxial radius and the image-side paraxial radius of the fourth lens 114 are negative numbers, and the object-side paraxial radius R7 and the image-side paraxial radius R8 of the fourth lens 114 satisfy: 0 < R8/R7<1, i.e., the curvature of the object side paraxial location of the fourth optic 114 is greater than the curvature of the image side paraxial location, such that the fourth optic 114 is capable of forming a positive meniscus configuration. The object-side paraxial radius and the image-side paraxial radius of the fifth lens element 115 are positive numbers, and the object-side paraxial radius R9 and the image-side paraxial radius R10 of the fifth lens element 115 satisfy: 1< R9/R10 is less than or equal to 3.5. Since both R9 and R10 are positive numbers, R9/R10 are greater than 1, i.e., the curvature of the object side paraxial position of the fifth lens 115 is greater than the curvature of the image side paraxial position, the fifth lens 115 can form a negative meniscus configuration. In this embodiment, R9/R10 is smaller than 3.5, and the divergence of the light rays by the fifth lens 115 can be controlled within a certain range, so as to ensure that as much light rays as possible are transmitted to the photosensitive element 20, thereby achieving a better imaging effect.
In some embodiments, the radius of curvature R4 of the image-side surface of the second lens 112 is co-directional with the radius of curvature R8 of the image-side surface of the fourth lens 114, i.e., R4/R8 > 0. The radius of curvature R4 of the image-side surface of the second lens 112 is set in the same direction as the radius of curvature R8 of the image-side surface of the fourth lens 114, and thus aberration generated by imaging of the optical lens 10 can be reduced. The radius of curvature R4 of the image-side surface of the second lens 112, the radius of curvature R8 of the image-side surface of the fourth lens 114, and the focal length f of the imaging lens satisfy: -0.5< (R4-R8)/fy <0 to minimize distortion resulting from imaging of the optical lens 10.
In some embodiments of the present application, each lens of the optical lens 10 may be made of plastic, glass, or other composite materials. Wherein, the plastic material can be easily made into various optical lens structures with complex shapes. The refractive index n1 of the glass lens satisfies the following conditions: n1 is more than or equal to 1.50 and less than or equal to 1.90, and compared with the refractive index range (1.55-1.65) of the plastic lens, the selectable range of the refractive index is larger, so that a thinner glass lens with better performance can be obtained more easily, the on-axis thickness of a plurality of lenses of the optical lens 10 can be reduced, and the optical lens structure with a complex shape can not be easily prepared. Therefore, in some embodiments of the present application, the specific application materials of different lenses are reasonably matched according to requirements in consideration of the manufacturing cost, efficiency and optical effect.
Some specific, but non-limiting examples of embodiments of the present application will be described in more detail below in conjunction with fig. 8-23.
Referring to fig. 8, fig. 8 is a schematic cross-sectional view of a plurality of lenses 11 of an optical lens 10 according to a first embodiment of the present application. In this embodiment, the optical lens 10 includes five lenses 11, which are respectively a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115, and the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, and the fifth lens 115 are disposed in order from an object side to an image side, and each of the lenses is disposed coaxially. The first lens 111 has a negative focal power, the second lens 112 has a positive focal power, the third lens 113 has a negative focal power, the fourth lens 114 has a positive focal power, and the fifth lens 115 has a negative focal power.
In this embodiment, the first lens 111 is a non-rotationally symmetric lens, and the other lenses 11 are rotationally symmetric lenses.
According to the above relations, the design parameters of the optical lens 10 according to the first embodiment of the present application are as shown in table 1 below.
Table 1 design parameters of optical lens of the first embodiment
Figure BDA0002350671530000111
Figure BDA0002350671530000121
Wherein S1 denotes an object side surface of the first lens 111, S2 denotes an image side surface of the first lens 111, S3 denotes an object side surface of the second lens 112, S4 denotes an image side surface of the second lens 112, S5 denotes an object side surface of the third lens 113, S6 denotes an image side surface of the third lens 113, S7 denotes an object side surface of the fourth lens 114, S8 denotes an image side surface of the fourth lens 114, S9 denotes an object side surface of the fifth lens 115, S10 denotes an image side surface of the fifth lens 115, S11 denotes an object side surface of the optical filter 30, and S12 denotes an image side surface of the optical filter 30. In the present application, the meanings of symbols such as S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, and S12 are the same, and are not described again in detail in the following description. In this embodiment, the ratio R8/R7 of the image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 is 0.303, i.e., the fourth lens 114 of this embodiment is a positive meniscus structure. The image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 are negative numbers. The ratio R9/R10 of the radius of curvature R9 of the object-side surface of the fifth lens element 115 to the radius of curvature R10 of the image-side surface of the fifth lens element 115 is 1.674, i.e., the fifth lens element 115 of the present embodiment has a negative meniscus configuration. The fourth lens element 114 is a negative meniscus structure, the fifth lens element 115 is a negative meniscus structure, and the combination of the fourth lens element 114 and the fifth lens element 115 can reduce the aberration generated by the optical lens assembly 10.
The radius of curvature R4 of the image-side surface of the second lens 112, the radius of curvature R8 of the image-side surface of the fourth lens 114, and the focal length f of the optical lens 10 satisfy: (R4-R8)/f is-0.183, and R4/R8 > 0, so that the optical lens 10 of the present application generates less aberration.
Table 2 shows basic parameters of the optical lens 10 in the embodiment of the present application, as shown in table 2.
Table 2 basic parameters of the optical lens of the first embodiment
f1(mm) -17.798 f4(mm) 3.132
f2(mm) 3.507 f5(mm) -16.670
f3(mm) -4.592 TTL(mm) 10.103
ImgH(mm) 5 FOV(°) 115
F value of aperture 2.233 |TDT| 1.2785％
f 3.291
Where f1 denotes a focal length of the first lens 111, f2 denotes a focal length of the second lens 112, f3 denotes a focal length of the third lens 113, f4 denotes a focal length of the fourth lens 114, f5 denotes a focal length of the fifth lens 115, f denotes a focal length of the optical lens 10, TTL denotes an optical total length of the optical lens 10, FOV denotes a field angle of the optical lens 10, ImgH denotes a half of a diagonal length of an effective pixel area on the photosensitive element 20, and TDT is a maximum value of TV distortion in an imaging range of the optical lens 10. It should be noted that, in the present application, the meanings of symbols such as f1, f2, f3, f4, f, TTL, FOV, ImgH, TDT, and the like are the same, and are not described again in the following.
As can be seen from the basic parameters of the optical lens 10, in the present embodiment, | f1/f | ═ 5.408; 1.066, | f2/f |; 1.395, | f3/f |; 0.952, | f4/f |; 5.065 | f5/f |. In the present embodiment, the focal lengths of the lenses 11 of the optical lens 10 are different, so that different lenses can play different roles, and the lenses can obtain a better imaging effect.
Referring to fig. 9, fig. 9 is a simulation diagram of the optical lens 10 of the present embodiment, in which a solid line grid is an ideal imaging grid diagram, and a grid structure formed by "X" is a schematic diagram of the optical lens 10 of the present embodiment after imaging. As is apparent from the drawing, the optical lens 10 of the present embodiment forms an image substantially the same as an ideal image, and the TV distortion in the imaging range of the optical lens 10 is small. Specifically, in the present embodiment, the maximum value TDT of TV distortion in the imaging range of the optical lens satisfies | TDT | ═ 1.2785%, and the TV distortion in the imaging range of the optical lens 10 is small. In the present embodiment, the field angle FOV of the optical lens 10 is 115 ° and the F-stop value is 2.233, that is, the optical lens 10 of the present invention can achieve a large field angle and a large stop, and can better satisfy the demand for image capturing. In the present embodiment, TTL is 10.103mm, ImgH is 5mm, and TTL/ImgH is 2.02, that is, the effective pixel area irradiated onto the photosensitive element 20 through the optical lens 10 of the present embodiment is large, the total optical length of the optical lens 10 can be small, high image quality can be obtained, the length of the optical lens 10 can be small, and the present embodiment can be applied to a thin terminal such as a mobile phone or a tablet.
Table 3 shows aspheric coefficients of the respective rotationally symmetric lenses (i.e., the second lens 112, the third lens 113, the fourth lens 114, and the fifth lens 115) of the optical lens 10 according to the present embodiment, as shown in table 3.
Table 3 design parameters of rotationally symmetric lens of optical lens system according to the first embodiment
Flour mark A4 A6 A8 A10 A12 A14 A16
S3 3.7477E-02 1.5218E-02 1.1741E-01 1.5394E-01 9.7821E-02 2.9933E-02 3.4895E-03
S4 -1.1180E-01 7.7502E-02 -6.2552E-02 3.8201E-02 -1.5487E-02 3.5728E-03 -3.5178E-04
S5 -1.0403E-01 2.4407E-02 -5.7496E-04 -2.8411E-03 1.4114E-03 -2.6522E-04 1.7109E-05
S6 -6.0223E-02 1.9796E-02 -4.4123E-03 5.2506E-04 9.0935E-06 -7.3595E-06 4.2308E-07
S7 -1.9350E-02 1.2528E-02 -3.3104E-03 7.9467E-04 -1.2875E-04 1.2151E-05 -5.1987E-07
S8 -2.2983E-02 -2.522E-03 1.9041E-03 -3.0196E-04 2.1502E-05 -1.6429E-07 -3.7167E-08
S9 1.7900E-03 -7.9812E-05 -7.0000E-06 -3.4794E-07 1.3238E-09 -1.7005E-10 6.1731E-11
S10 -1.1500E-03 2.7000E-05 -1.0000E-06 -2.4280E-08 1.5697E-09 -1.7064E-10 5.5509E-12
The symbols a4, a6, A8, a10, a12, a14, a16, and the like represent polynomial coefficients. Each parameter in the table is represented by a scientific notation. For example, 3.7477E-02 refers to 3.7477X 10-2(ii) a -1.1180E-01 means-1.1180 Ex 10-2。
By substituting the above parameters into the formula:
Figure BDA0002350671530000131
namely, the second lens 112, the third lens 113, the fourth lens 114 and the fifth lens 115 can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000132
table 4 shows aspheric coefficients of the non-rotationally symmetric lens (i.e., the first lens 111) of the optical lens 10 of the present embodiment, as shown in table 4.
Table 4 design parameters of non-rotationally symmetric lens of optical lens of the first embodiment
Figure BDA0002350671530000133
Figure BDA0002350671530000141
The symbols of a10, a12, a14, a21,. …, a144, a146, a150, a152 and the like all represent polynomial coefficients.
A formula satisfied by substituting the above parameters into a free-form surface:
Figure BDA0002350671530000142
that is, the non-rotationally symmetric lens (i.e., the first lens 111) of the present embodiment can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000143
wherein polynomial coefficients not present in the table (e.g. A)1、A2Etc.) is 0.
Referring to fig. 10, fig. 10 shows an optical lens 10 according to a second embodiment of the present application. Referring to fig. 10, fig. 10 is a schematic structural diagram of an optical lens 10 according to a second embodiment of the present application. In this embodiment, the optical lens 10 includes five lenses 11, which are respectively a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115, and the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, and the fifth lens 115 are disposed in order from an object side to an image side, and each of the lenses is disposed coaxially. The first lens 111 has a negative focal power, the second lens 112 has a positive focal power, the third lens 113 has a negative focal power, the fourth lens 114 has a positive focal power, and the fifth lens 115 has a negative focal power.
In this embodiment, the fifth lens 115 is a non-rotationally symmetric lens, and the other lenses 11 are rotationally symmetric lenses.
According to the above relations, the design parameters of the optical lens 10 according to the second embodiment of the present application are as shown in table 5 below.
Table 5 design parameters of optical lens of the second embodiment
Figure BDA0002350671530000144
Figure BDA0002350671530000151
In this embodiment, the ratio R8/R7 of the image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 is 0.304, i.e., the fourth lens 114 of this embodiment is a positive meniscus structure. The image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 are negative numbers. The ratio R9/R10 of the radius of curvature R9 of the object-side surface of the fifth lens element 115 to the radius of curvature R10 of the image-side surface of the fifth lens element 115 is 2.133, i.e., the fifth lens element 115 of the present embodiment has a negative meniscus configuration. The fourth lens element 114 is a negative meniscus structure, the fifth lens element 115 is a negative meniscus structure, and the combination of the fourth lens element 114 and the fifth lens element 115 can reduce the aberration generated by the optical lens assembly 10.
The radius of curvature R4 of the image-side surface of the second lens 112, the radius of curvature R8 of the image-side surface of the fourth lens 114, and the focal length f of the optical lens 10 satisfy: (R4-R8)/f is-0.170, and R4/R8 > 0, so that the optical lens 10 of the present application generates less aberration.
Table 6 shows basic parameters of the optical lens 10 in the embodiment of the present application, as shown in table 6.
TABLE 6 basic parameters of optical lens of the second embodiment
f1(mm) -18.148 f4(mm) 3.115
f2(mm) 3.506 f5(mm) -10.782
f3(mm) -4.432 TTL(mm) 10.294
ImgH(mm) 5 FOV(°) 116
F value of aperture 2.236 |TDT| 1.3013％
f 3.551
As can be seen from the basic parameters of the optical lens 10, in the present embodiment, | f1/f | ═ 5.111; 0.987, | f2/f |; 1.248, | f3/f |; 0.877, | f4/f |; i f5/f i 3.036. In the present embodiment, the focal lengths of the lenses 11 of the optical lens 10 are different, so that different lenses can play different roles, and the lenses can obtain a better imaging effect.
Referring to fig. 11, fig. 11 is a simulation diagram of the optical lens 10 of the present embodiment, in which a solid line grid is an ideal imaging grid diagram, and a grid structure formed by "X" is a schematic diagram of the optical lens 10 of the present embodiment after imaging. As is apparent from the drawing, the optical lens 10 of the present embodiment forms an image substantially the same as an ideal image, and the TV distortion in the imaging range of the optical lens 10 is small. Specifically, in the present embodiment, the maximum value TDT of TV distortion in the imaging range of the optical lens satisfies | TDT | ═ 1.3013%, and the TV distortion in the imaging range of the optical lens 10 is small. In the present embodiment, the field angle FOV of the optical lens 10 is 116 °, and the F-stop value is 2.236, that is, the optical lens 10 of the present invention can realize a large field angle and a large stop, and can better satisfy the demand for image capturing. In the present embodiment, TTL is 10.294mm, ImgH is 5mm, and TTL/ImgH is 2.06, that is, the effective pixel area irradiated onto the photosensitive element 20 through the optical lens 10 of the present embodiment is large, and the total optical length of the optical lens 10 can be small, so that high image quality can be obtained, and the length of the optical lens 10 can be small, and thus the present embodiment can be applied to a thin terminal such as a mobile phone or a tablet.
Table 7 shows aspheric coefficients of the respective rotationally symmetric lenses (i.e., the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114) of the optical lens 10 according to the present embodiment, as shown in table 7.
TABLE 7 design parameters of rotationally symmetric lenses of optical lens of the second embodiment
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 5.1442E-02 -1.1823E-02 2.6872E-03 -3.8029E-04 2.5791E-05 -2.4036E-07 -2.9762E-08
S2 1.0485E-01 -3.7944E-02 1.7672E-02 -2.5080E-03 4.5530E-04 -4.0302E-05 9.9784E-07
S3 4.0423E-02 -2.5080E-02 -2.6079E-02 5.7768E-02 -4.3456E-02 1.4105E-02 -1.6389E-03
S4 -1.0494E-01 5.8673E-02 -3.9364E-02 2.2219E-02 -9.2112E-03 2.2829E-03 -2.4451E-04
S5 -1.0335E-01 1.2030E-02 1.4363E-02 -1.0869E-02 3.6892E-03 -5.9778E-04 3.6709E-05
S6 -5.8854E-02 1.9573E-02 -4.7739E-03 7.7561E-04 -6.1273E-05 1.7989E-06 -3.2099E-08
S7 -2.1584E-02 1.6806E-02 -6.2113E-03 1.6738E-03 -2.5458E-04 1.9635E-05 -6.0816E-07
S8 -3.0568E-02 5.5472E-03 -8.6914E-04 6.8743E-05 1.7075E-05 -3.1144E-06 1.3604E-07
The symbols a4, a6, A8, a10, a12, a14, a16, and the like represent polynomial coefficients.
The formula satisfied by substituting the above parameters into a rotationally symmetric aspheric surface:
Figure BDA0002350671530000161
namely, the first lens 111, the second lens 112, the third lens 113 and the fourth lens 114 can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000162
table 8 shows aspheric coefficients of the non-rotationally symmetric lens (i.e., the fifth lens 115) of the optical lens 10 of the present embodiment, as shown in table 8.
TABLE 8 design parameters of non-rotationally symmetric lenses of optical lens of the second embodiment
Figure BDA0002350671530000163
Figure BDA0002350671530000171
The symbols of a10, a12, a14, a21,. …, a144, a146, a150, a152 and the like all represent polynomial coefficients.
A formula satisfied by substituting the above parameters into a free-form surface:
Figure BDA0002350671530000172
that is, the non-rotationally symmetric lens (i.e., the fifth lens 115) of the present embodiment can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000173
wherein polynomial coefficients not present in the table (e.g. A)1、A2Etc.) is 0.
Referring to fig. 12, fig. 12 is a schematic structural diagram of an optical lens 10 according to a third embodiment of the present application. In this embodiment, the optical lens 10 includes five lenses 11, which are respectively a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115, wherein the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, the fifth lens 115, and the sixth lens 16 are disposed in order from an object side to an image side, and the lenses are disposed coaxially. The first lens 111 has a negative focal power, the second lens 112 has a positive focal power, the third lens 113 has a negative focal power, the fourth lens 114 has a positive focal power, and the fifth lens 115 has a negative focal power.
In this embodiment, the fifth lens 115 is a non-rotationally symmetric lens, and the other lenses 11 are rotationally symmetric lenses.
According to the above relations, the design parameters of the optical lens 10 according to the third embodiment of the present application are as shown in table 9 below.
Table 9 design parameters of optical lens of the third embodiment
Figure BDA0002350671530000174
Figure BDA0002350671530000181
In this embodiment, the ratio R8/R7 of the image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 is 0.446, i.e., the fourth lens 114 of this embodiment is of a positive meniscus configuration. The image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 are negative numbers. The ratio R9/R10 of the radius of curvature R9 of the object-side surface of the fifth lens element 115 to the radius of curvature R10 of the image-side surface of the fifth lens element 115 is 3.287, i.e., the fifth lens element 115 of the present embodiment has a negative meniscus configuration. The fourth lens element 114 is a negative meniscus structure, the fifth lens element 115 is a negative meniscus structure, and the combination of the fourth lens element 114 and the fifth lens element 115 can reduce the aberration generated by the optical lens assembly 10.
The radius of curvature R4 of the image-side surface of the second lens 112, the radius of curvature R8 of the image-side surface of the fourth lens 114, and the focal length f of the optical lens 10 satisfy: (R4-R8)/f is-0.2, and R4/R8 > 0, so that the optical lens 10 of the present application generates less aberration.
Table 10 shows basic parameters of the optical lens 10 in the embodiment of the present application, as shown in table 10.
TABLE 10 basic parameters of optical lens of the third embodiment
f1(mm) -14.916 f4(mm) 3.346
f2(mm) 4.030 f5(mm) -8.740
f3(mm) -9.171 TTL(mm) 11.677
ImgH(mm) 5 FOV(°) 102
F value of aperture 2.045 |TDT| 1.9811％
f 4.012
As can be seen from the basic parameters of the optical lens 10, in the present embodiment, | f1/f | ═ 3.718; 1.005, | f2/f |; 2.286, | f3/f |; 0.834, | f4/f |; 2.179 | f5/f |. In the present embodiment, the focal lengths of the lenses 11 of the optical lens 10 are different, so that different lenses can play different roles, and the lenses can obtain a better imaging effect.
Referring to fig. 13, fig. 13 is a simulation diagram of the optical lens 10 of the present embodiment, in which a solid line grid is an ideal imaging grid diagram, and a grid structure formed by "X" is a schematic diagram of the optical lens 10 of the present embodiment after imaging. As is apparent from the drawing, the optical lens 10 of the present embodiment forms an image substantially the same as an ideal image, and the TV distortion in the imaging range of the optical lens 10 is small. Specifically, in the present embodiment, the maximum value TDT of TV distortion in the imaging range of the optical lens satisfies | TDT | ═ 1.9811%, and the TV distortion in the imaging range of the optical lens 10 is small. In the present embodiment, the field angle FOV of the optical lens 10 is 102 °, and the F-stop value is 2.045, that is, the optical lens 10 of the present invention can achieve a large field angle and a large F-stop, and can better satisfy the demand for shooting. In the present embodiment, TTL is 11.677mm, ImgH is 5mm, and TTL/ImgH is 2.34, that is, the effective pixel area irradiated onto the photosensitive element 20 through the optical lens 10 of the present embodiment is large, the total optical length of the optical lens 10 can be small, high imaging quality can be obtained, the length of the optical lens 10 can be small, and the present embodiment can be applied to a thin terminal such as a mobile phone or a tablet.
Table 11 shows aspheric coefficients of the respective rotationally symmetric lenses (i.e., the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114) of the optical lens 10 according to the present embodiment, as shown in table 11.
Table 11 design parameters of rotationally symmetric lens of optical lens system according to the third embodiment
Figure BDA0002350671530000182
Figure BDA0002350671530000191
The symbols a4, a6, A8, a10, a12, a14, a16, and the like represent polynomial coefficients.
The formula satisfied by substituting the above parameters into a rotationally symmetric aspheric surface:
Figure BDA0002350671530000192
in this way, the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114 can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000193
table 12 shows aspheric coefficients of the non-rotationally symmetric lens (i.e., the fifth lens 115) of the optical lens 10 of the present embodiment, as shown in table 12.
TABLE 12 design parameters of non-rotationally symmetric lenses of optical lens of the third embodiment
Number of noodles A10 A12 A14 A21 A23 A25 A27 A36 A38 A40
S9 0.007021 0.014429 0.007041 -0.000572 -0.001789 -0.001745 -0.000564 0.000013 0.000054 0.000082
S10 -0.002815 -0.005623 -0.002562 0.000213 0.000622 0.000613 0.000221 -0.000005 -0.000018 -0.000029
Number of noodles A42 A44 A55 A57 A59 A61 A63 A65 A78 A80
S9 5.761E-05 1.486E-05 2.996E-08 5.146E-07 1.146E-06 1.369E-06 7.003E-07 1.091E-07 -1.084E-08 -4.529E-08
S10 -1.678E-05 -4.934E-06 6.626E-08 4.091E-07 6.545E-07 1.534E-06 8.655E-07 6.502E-08 1.787E-09 1.246E-08
Number of noodles A82 A84 A86 A88 A90 A105 A107 A109 A111 A113
S9 -9.046E-08 -1.498E-07 -1.832E-07 -5.874E-08 -1.101E-08 1.365E-10 6.739E-10 2.217E-10 1.307E-10 -3.461E-09
S10 2.429E-08 2.435E-08 3.938E-08 -8.328E-09 -2.851E-10 6.618E-11 -2.534E-10 -1.824E-09 -3.213E-09 -5.022E-09
Number of noodles A115 A117 A119 A136 A138 A140 A142 A144 A146 A148
S9 3.276E-09 -1.520E-09 1.674E-11 2.626E-11 -1.458E-11 -1.705E-10 -3.817E-10 -7.512E-10 -8.813E-10 -1.901E-10
S10 -3.603E-09 -4.439E-09 -7.191E-11 -7.258E-12 3.057E-12 -1.564E-10 -3.402E-10 -6.143E-10 -3.235E-10 3.835E-10
Number of noodles A150 A152
S9 -1.944E-10 -8.158E-12
S10 -1.720E-10 -6.985E-12
The symbols of a10, a12, a14, a21,. …, a144, a146, a150, a152 and the like all represent polynomial coefficients.
A formula satisfied by substituting the above parameters into a free-form surface:
Figure BDA0002350671530000201
that is, the non-rotationally symmetric lens (i.e., the first lens 111) of the present embodiment can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000202
wherein polynomial coefficients not present in the table (e.g. A)1、A2Etc.) is 0.
Referring to fig. 13, fig. 13 is a schematic structural diagram of an optical lens 10 according to a first embodiment of the present application. In this embodiment, the optical lens 10 includes five lenses 11, which are respectively a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115, wherein the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, the fifth lens 115, and the sixth lens 16 are disposed in order from an object side to an image side, and the lenses are disposed coaxially. The first lens 111 has a negative focal power, the second lens 112 has a positive focal power, the third lens 113 has a negative focal power, the fourth lens 114 has a positive focal power, and the fifth lens 115 has a negative focal power.
In this embodiment, the fifth lens 115 is a non-rotationally symmetric lens, and the other lenses 11 are rotationally symmetric lenses.
According to the above relations, the design parameters of the optical lens 10 according to the fourth embodiment of the present application are as shown in table 13 below.
Table 13 design parameters of optical lens of the fourth embodiment
Figure BDA0002350671530000203
In this embodiment, the ratio R8/R7 of the image-side paraxial radius R8 to the object-side paraxial radius R7 of the fourth lens 114 is 0.449, i.e., the fourth lens 114 of this embodiment is of a positive meniscus configuration. The image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 are negative numbers. The ratio R9/R10 of the radius of curvature R9 of the object-side surface of the fifth lens element 115 to the radius of curvature R10 of the image-side surface of the fifth lens element 115 is 3.178, i.e., the fifth lens element 115 of the present embodiment has a negative meniscus configuration. The fourth lens element 114 is a negative meniscus structure, the fifth lens element 115 is a negative meniscus structure, and the combination of the fourth lens element 114 and the fifth lens element 115 can reduce the aberration generated by the optical lens assembly 10.
The radius of curvature R4 of the image-side surface of the second lens 112, the radius of curvature R8 of the image-side surface of the fourth lens 114, and the focal length f of the optical lens 10 satisfy: (R4-R8)/f is-0.204, and R4/R8 > 0, so that the optical lens 10 of the present application generates less aberration.
Table 14 shows basic parameters of the optical lens 10 in the embodiment of the present application, as shown in table 14.
TABLE 14 basic parameters of optical lens of the fourth embodiment
f1(mm) -21.403 f4(mm) 3.360
f2(mm) 4.069 f5(mm) -8.740
f3(mm) -8.205 TTL(mm) 10.339
ImgH(mm) 5 FOV(°) 123
F value of aperture 2.049 |TDT| 1.7678％
f 4.184
Where f1 denotes a focal length of the first lens 111, f2 denotes a focal length of the second lens 112, f3 denotes a focal length of the third lens 113, f4 denotes a focal length of the fourth lens 114, f5 denotes a focal length of the fifth lens 115, f denotes a focal length of the optical lens 10, TTL denotes an optical total length of the optical lens 10, FOV denotes a field angle of the optical lens 10, ImgH denotes a half of a diagonal length of an effective pixel area on the photosensitive element 20, and TDT is a maximum value of TV distortion in an imaging range of the optical lens 10. It should be noted that, in the present application, the meanings of symbols such as f1, f2, f3, f4, f, TTL, FOV, ImgH, TDT, and the like are the same, and are not described again in the following.
As can be seen from the basic parameters of the optical lens 10, in the present embodiment, | f1/f |, 5.116; 0.973, | f2/f |; 1.961, | f3/f |; 0.803 | f4/f |; i f5/f 2.089. In the present embodiment, the focal lengths of the lenses 11 of the optical lens 10 are different, so that different lenses can play different roles, and the lenses can obtain a better imaging effect.
Referring to fig. 14, fig. 14 is a simulation diagram of the optical lens 10 of the present embodiment, in which a solid line grid is an ideal imaging grid diagram, and a grid structure formed by "X" is a schematic diagram of the optical lens 10 of the present embodiment after imaging. As is apparent from the drawing, the optical lens 10 of the present embodiment forms an image substantially the same as an ideal image, and the TV distortion in the imaging range of the optical lens 10 is small. Specifically, in the present embodiment, the maximum value TDT of TV distortion in the imaging range of the optical lens satisfies | TDT | ═ 1.7678%, and the TV distortion in the imaging range of the optical lens 10 is small. In the present embodiment, the field angle FOV of the optical lens 10 is 115 ° and the F-stop value is 2.233, that is, the optical lens 10 of the present invention can achieve a large field angle and a large stop, and can better satisfy the demand for image capturing. In the present embodiment, TTL is 10.339mm, ImgH is 5mm, and TTL/ImgH is 2.068, that is, the total optical length of the optical lens 10 can be small while the effective pixel area irradiated onto the photosensitive element 20 through the optical lens 10 of the present embodiment is large, so that high image quality can be obtained, the length of the optical lens 10 can be small, and the present embodiment can be applied to a thin terminal such as a mobile phone or a tablet.
Table 15 shows aspheric coefficients of the respective rotationally symmetric lenses (i.e., the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114) of the optical lens 10 according to the present embodiment, as shown in table 15.
TABLE 15 design parameters of rotationally symmetric lenses of optical lens of the fourth embodiment
Figure BDA0002350671530000211
Figure BDA0002350671530000221
The symbols a4, a6, A8, a10, a12, a14, a16, and the like represent polynomial coefficients.
The formula satisfied by substituting the above parameters into a rotationally symmetric aspheric surface:
Figure BDA0002350671530000222
namely, the second lens 112, the third lens 113, the fourth lens 114 and the fifth lens 115 can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000223
table 16 shows aspheric coefficients of the non-rotationally symmetric lens (i.e., the fifth lens 115) of the optical lens 10 according to the present embodiment, as shown in table 16.
TABLE 16 design parameters of non-rotationally symmetric lenses of optical lens of the fourth embodiment
Number of noodles A10 A12 A14 A21 A23 A25 A27 A36 A38 A40
S9 0.005700 0.011403 0.005569 -0.000615 -0.002031 -0.002026 -0.000573 0.000011 0.000051 0.000078
S10 -0.003132 -0.006507 -0.002343 0.000179 0.000549 0.000491 0.000273 -0.000005 -0.000023 -0.000037
Number of noodles A42 A44 A55 A57 A59 A61 A63 A65 A78 A80
S9 5.531E-05 1.623E-05 -2.305E-07 3.956E-07 1.116E-06 1.459E-06 2.871E-06 6.064E-08 -3.864E-08 -2.963E-08
S10 -2.716E-05 -2.709E-06 6.496E-08 2.293E-07 1.058E-06 1.874E-06 8.052E-07 -2.091E-07 -2.061E-09 -6.211E-09
Number of noodles A82 A84 A86 A88 A90 A105 A107 A109 A111 A113
S9 -8.196E-08 -1.075E-07 -1.496E-07 1.320E-07 -1.674E-08 1.929E-09 -3.056E-09 -6.677E-09 5.311E-10 -2.573E-08
S10 2.045E-08 1.314E-08 1.006E-08 -2.504E-07 -8.815E-09 4.044E-10 -8.777E-10 -2.098E-09 -5.314E-09 -1.014E-08
Number of noodles A115 A117 A119 A136 A138 A140 A142 A144 A146 A148
S9 -4.312E-08 -8.392E-09 -4.698E-10 2.478E-10 8.713E-10 -3.677E-10 -2.481E-09 -3.508E-09 -7.754E-09 -9.915E-09
S10 -8.645E-09 -1.645E-08 1.961E-10 1.659E-11 1.452E-10 1.381E-10 5.164E-11 -1.830E-10 1.295E-11 7.251E-10
Number of noodles A150 A152
S9 -3.952E-09 -2.708E-11
S10 7.767E-10 9.440E-14
The symbols of a10, a12, a14, a21,. …, a144, a146, a150, a152 and the like all represent polynomial coefficients.
A formula satisfied by substituting the above parameters into a free-form surface:
Figure BDA0002350671530000231
that is, the non-rotationally symmetric lens (i.e., the first lens 111) of the present embodiment can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000232
wherein polynomial coefficients not present in the table (e.g. A)1、A2Etc.) is 0.
Referring to fig. 15, fig. 15 is a schematic structural diagram of an optical lens 10 according to a fifth embodiment of the present application. In this embodiment, the optical lens 10 includes five lenses 11, which are respectively a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115, wherein the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, the fifth lens 115, and the sixth lens 16 are disposed in order from an object side to an image side, and the lenses are disposed coaxially. The first lens 111 has a negative focal power, the second lens 112 has a positive focal power, the third lens 113 has a negative focal power, the fourth lens 114 has a positive focal power, and the fifth lens 115 has a negative focal power.
In this embodiment, the fifth lens 115 is a non-rotationally symmetric lens, and the other lenses 11 are rotationally symmetric lenses.
According to the above relations, the design parameters of the optical lens 10 according to the fifth embodiment of the present application are as shown in table 17 below.
Table 17 design parameters of optical lens of fifth embodiment
Figure BDA0002350671530000233
In this embodiment, the ratio R8/R7 of the image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 is 0.353, i.e., the fourth lens 114 of this embodiment is a positive meniscus structure. The image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 are negative numbers. The ratio R9/R10 of the curvature radius R9 of the object-side surface of the fifth lens element 115 to the curvature radius R10 of the image-side surface of the fifth lens element 115 is 1.471, i.e., the fifth lens element 115 of the present embodiment has a negative meniscus configuration. The fourth lens element 114 is a negative meniscus structure, the fifth lens element 115 is a negative meniscus structure, and the combination of the fourth lens element 114 and the fifth lens element 115 can reduce the aberration generated by the optical lens assembly 10.
The radius of curvature R4 of the image-side surface of the second lens 112, the radius of curvature R8 of the image-side surface of the fourth lens 114, and the focal length f of the optical lens 10 satisfy: (R4-R8)/f is-0.105, and R4/R8 > 0, so that the optical lens 10 of the present application generates less aberration.
Table 18 shows basic parameters of the optical lens 10 in the embodiment of the present application, as shown in table 18.
Table 18 basic parameters of optical lens in the fifth embodiment
f1(mm) -17.194 f4(mm) 3.800
f2(mm) 3.606 f5(mm) -35.389
f3(mm) -4.504 TTL(mm) 10.774
ImgH(mm) 5 FOV(°) 116
F value of aperture 2.238 |TDT| 1.8991％
f 3.747
As can be seen from the basic parameters of the optical lens 10, in the present embodiment, | f1/f | ═ 4.590; 0.963, | f2/f |; 1.202, | f3/f |; 1.015, | f4/f |; 9.448 | f5/f |. In the present embodiment, the focal lengths of the lenses 11 of the optical lens 10 are different, so that different lenses can play different roles, and the lenses can obtain a better imaging effect.
Referring to fig. 16, fig. 16 is a simulation diagram of the optical lens 10 of the present embodiment, in which a solid line grid is an ideal imaging grid diagram, and a grid structure formed by "X" is a schematic diagram of the optical lens 10 of the present embodiment after imaging. As is apparent from the drawing, the optical lens 10 of the present embodiment forms an image substantially the same as an ideal image, and the TV distortion in the imaging range of the optical lens 10 is small. Specifically, in the present embodiment, the maximum value TDT of TV distortion in the imaging range of the optical lens satisfies | TDT | ═ 1.8991%, and the TV distortion in the imaging range of the optical lens 10 is small. In the present embodiment, the field angle FOV of the optical lens 10 is 116 °, and the F-stop value is 2.238, that is, the optical lens 10 of the present invention can achieve a large field angle and a large stop, and can better satisfy the demand for image capturing. In the present embodiment, TTL is 10.774mm, ImgH is 5mm, and TTL/ImgH is 2.155, that is, the total optical length of the optical lens 10 can be small while the effective pixel area irradiated onto the photosensitive element 20 through the optical lens 10 of the present embodiment is large, so that high image quality can be obtained, the length of the optical lens 10 can be small, and the present embodiment can be applied to a thin terminal such as a mobile phone or a tablet.
Table 19 shows aspheric coefficients of the respective rotationally symmetric lenses (the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114) of the optical lens 10 according to the present embodiment, as shown in table 19.
Table 19 design parameters of rotationally symmetric lens of optical lens system according to fifth embodiment
Figure BDA0002350671530000241
Figure BDA0002350671530000251
The symbols a4, a6, A8, a10, a12, a14, a16, and the like represent polynomial coefficients.
The formula satisfied by substituting the above parameters into a rotationally symmetric aspheric surface:
Figure BDA0002350671530000252
namely, the second lens 112, the third lens 113, the fourth lens 114 and the fifth lens 115 can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000253
table 20 shows aspheric coefficients of the non-rotationally symmetric lens (i.e., fifth lens 115) of the optical lens 10 of the present embodiment, as shown in table 20.
TABLE 20 design parameters of non-rotationally symmetric lenses of optical lens of the fifth embodiment
Number of noodles A10 A12 A14 A21 A23 A25 A27 A36 A38 A40
S9 0.016837 0.031514 0.018442 -0.003850 -0.009753 -0.009611 -0.004002 0.000436 0.001594 0.002392
S10 -0.031193 -0.051359 -0.030567 0.007386 0.021069 0.022061 0.007137 -0.001214 -0.004929 -0.007457
Number of noodles A42 A44 A55 A57 A59 A61 A63 A65 A78 A80
S9 0.001547 0.000428 -0.000039 -0.000220 -0.000443 -0.000435 -0.000200 -0.000043 0.000003 0.000019
S10 -0.004839 -0.001231 0.000130 0.000646 0.001286 0.001284 0.000653 0.000129 -0.000008 -0.000047
Number of noodles A82 A84 A86 A88 A90 A105 A107 A109 A111 A113
S9 4.774E-05 6.379E-05 4.786E-05 1.932E-05 3.132E-06 -1.321E-07 -8.158E-07 -2.458E-06 -4.013E-06 -4.092E-06
S10 -1.179E-04 -1.576E-04 -1.172E-04 -4.685E-05 -7.885E-06 2.548E-07 1.798E-06 5.413E-06 8.966E-06 9.074E-06
Number of noodles A115 A117 A119 A136 A138 A140 A142 A144 A146 A148
S9 -2.532E-06 -8.718E-07 -1.161E-07 2.845E-10 1.123E-08 3.799E-08 8.746E-08 1.171E-07 7.763E-08 2.026E-08
S10 5.462E-06 1.623E-06 2.634E-07 -3.925E-09 -2.922E-08 -9.485E-08 -1.992E-07 -2.437E-07 -1.775E-07 -1.281E-07
Number of noodles A150 A152
S9 -6.107E-09 1.614E-09
S10 -3.122E-08 -3.750E-09
The symbols of a10, a12, a14, a21,. …, a144, a146, a150, a152 and the like all represent polynomial coefficients.
A formula satisfied by substituting the above parameters into a free-form surface:
Figure BDA0002350671530000254
that is, the non-rotationally symmetric lens (i.e., the fifth lens 115) of the present embodiment can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000261
wherein polynomial coefficients not present in the table (e.g. A)1、A2Etc.) is 0.
Referring to fig. 17, fig. 17 is a schematic structural diagram of an optical lens 10 according to a sixth embodiment of the present application. In this embodiment, the optical lens 10 includes five lenses 11, which are respectively a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115, wherein the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, the fifth lens 115, and the sixth lens 16 are disposed in order from an object side to an image side, and the lenses are disposed coaxially. The first lens 111 has a negative focal power, the second lens 112 has a positive focal power, the third lens 113 has a negative focal power, the fourth lens 114 has a positive focal power, and the fifth lens 115 has a negative focal power.
In this embodiment, the fifth lens 115 is a non-rotationally symmetric lens, and the other lenses 11 are rotationally symmetric lenses.
According to the above relations, the design parameters of the optical lens 10 according to the sixth embodiment of the present application are as shown in table 21 below.
Table 21 design parameters of optical lens of sixth embodiment
Figure BDA0002350671530000262
In this embodiment, the ratio R8/R7 of the image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 is 0.300, i.e., the fourth lens 114 of this embodiment is a positive meniscus structure. The image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 are negative numbers. The ratio R9/R10 of the curvature radius R9 of the object-side surface of the fifth lens element 115 to the curvature radius R10 of the image-side surface of the fifth lens element 115 is 2.227, i.e., the fifth lens element 115 of the present embodiment has a negative meniscus configuration.
The radius of curvature R4 of the image-side surface of the second lens 112, the radius of curvature R8 of the image-side surface of the fourth lens 114, and the focal length f of the optical lens 10 satisfy: (R4-R8)/f is-0.188, and R4/R8 > 0, so that the optical lens 10 of the present application generates less aberration.
Table 22 shows basic parameters of the optical lens 10 in the embodiment of the present application, as shown in table 22.
Table 22 basic parameters of optical lens of the sixth embodiment
f1(mm) -13.646 f4(mm) 3.056
f2(mm) 3.304 f5(mm) -10.047
f3(mm) -4.353 TTL(mm) 10.380
ImgH(mm) 5 FOV(°) 116
F value of aperture 2.240 |TDT| 1.0784％
f 3.463
Where f1 denotes a focal length of the first lens 111, f2 denotes a focal length of the second lens 112, f3 denotes a focal length of the third lens 113, f4 denotes a focal length of the fourth lens 114, f5 denotes a focal length of the fifth lens 115, f denotes a focal length of the optical lens 10, TTL denotes an optical total length of the optical lens 10, FOV denotes a field angle of the optical lens 10, ImgH denotes a half of a diagonal length of an effective pixel area on the photosensitive element 20, and TDT is a maximum value of TV distortion in an imaging range of the optical lens 10. It should be noted that, in the present application, the meanings of symbols such as f1, f2, f3, f4, f, TTL, FOV, ImgH, TDT, and the like are the same, and are not described again in the following.
As can be seen from the basic parameters of the optical lens 10, in the present embodiment, | f1/f | ═ 3.940; 0.954, | f2/f |; 1.257, | f3/f |; 0.882, | f4/f |; 2.901 | f5/f |. In the present embodiment, the focal lengths of the lenses 11 of the optical lens 10 are different, so that different lenses can play different roles, and the lenses can obtain a better imaging effect.
Referring to fig. 18, fig. 18 is a simulation diagram of the optical lens 10 of the present embodiment, in which a solid line grid is an ideal imaging grid diagram, and a grid structure formed by "X" is a schematic diagram of the optical lens 10 of the present embodiment after imaging. As is apparent from the drawing, the optical lens 10 of the present embodiment forms an image substantially the same as an ideal image, and the TV distortion in the imaging range of the optical lens 10 is small. Specifically, in the present embodiment, the maximum value TDT of TV distortion in the imaging range of the optical lens satisfies | TDT | ═ 1.0784%, and the TV distortion in the imaging range of the optical lens 10 is small. In the present embodiment, the field angle FOV of the optical lens 10 is 116 °, and the F-stop value is 2.240, that is, the optical lens 10 of the present invention can achieve a large field angle and a large stop, and can better satisfy the demand for image capturing. In the present embodiment, TTL is 10.380mm, ImgH is 5mm, and TTL/ImgH is 2.076, that is, the effective pixel area irradiated onto the photosensitive element 20 through the optical lens 10 of the present embodiment is large, the total optical length of the optical lens 10 can be small, high image quality can be obtained, the length of the optical lens 10 can be small, and the present embodiment can be applied to a thin terminal such as a mobile phone or a tablet.
Table 23 shows aspheric coefficients of the respective rotationally symmetric lenses (the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114) of the optical lens 10 according to the present embodiment, as shown in table 23.
Table 23 design parameters of rotationally symmetric lens of optical lens system according to sixth embodiment
Figure BDA0002350671530000271
Figure BDA0002350671530000281
The symbols a4, a6, A8, a10, a12, a14, a16, and the like represent polynomial coefficients.
The formula satisfied by substituting the above parameters into a rotationally symmetric aspheric surface:
Figure BDA0002350671530000282
namely, the first lens 111, the second lens 112, the third lens 113 and the fourth lens 114 can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000283
table 24 shows aspheric coefficients of the non-rotationally symmetric lens (i.e., the fifth lens 115) of the optical lens 10 according to the present embodiment, as shown in table 24.
Table 24 design parameters of non-rotationally symmetric lens of optical lens of sixth embodiment
Number of noodles A10 A12 A14 A21 A23 A25 A27 A36 A38 A40
S9 1.415E-02 2.558E-02 1.341E-02 -3.972E-03 -9.838E-03 -1.002E-02 -3.560E-03 4.357E-04 1.544E-03 2.383E-03
S10 -3.345E-02 -5.051E-02 -3.131E-02 7.674E-03 2.103E-02 2.213E-02 7.075E-03 -1.193E-03 -4.921E-03 -7.454E-03
Number of noodles A42 A44 A55 A57 A59 A61 A63 A65 A78 A80
S9 1.664E-03 3.701E-04 -3.655E-05 -2.161E-04 -4.389E-04 -4.061E-04 -2.227E-04 -4.333E-05 3.483E-06 2.100E-05
S10 -4.833E-03 -1.215E-03 1.291E-04 6.480E-04 1.285E-03 1.289E-03 6.519E-04 1.261E-04 -7.958E-06 -4.716E-05
Number of noodles A82 A84 A86 A88 A90 A105 A107 A109 A111 A113
S9 4.814E-05 6.548E-05 4.523E-05 2.039E-05 3.206E-06 -1.317E-07 -7.649E-07 -2.371E-06 -3.266E-06 -4.678E-06
S10 -1.183E-04 -1.568E-04 -1.165E-04 -4.838E-05 -7.930E-06 2.503E-07 1.799E-06 5.418E-06 8.873E-06 9.151E-06
Number of noodles A115 A117 A119 A136 A138 A140 A142 A144 A146 A148
S9 -2.088E-06 -3.588E-07 -1.067E-07 -5.055E-09 -1.200E-08 -6.564E-09 5.110E-08 8.133E-08 -2.253E-08 -2.110E-08
S10 5.594E-06 1.579E-06 2.675E-07 -3.826E-09 -3.160E-08 -8.973E-08 -1.957E-07 -2.611E-07 -1.703E-07 -1.572E-07
Number of noodles A150 A152
S9 -7.806E-08 2.026E-09
S10 -2.452E-08 -3.085E-09
The symbols of a10, a12, a14, a21,. …, a144, a146, a150, a152 and the like all represent polynomial coefficients.
A formula satisfied by substituting the above parameters into a free-form surface:
Figure BDA0002350671530000284
that is, the non-rotationally symmetric lens (i.e., the fifth lens 115) of the present embodiment can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000291
wherein polynomial coefficients not present in the table (e.g. A)1、A2Etc.) is 0.
Referring to fig. 19, fig. 19 is a schematic structural diagram of an optical lens 10 according to a seventh embodiment of the present application. In this embodiment, the optical lens 10 includes five lenses 11, which are respectively a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115, wherein the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, the fifth lens 115, and the sixth lens 16 are disposed in order from an object side to an image side, and the lenses are disposed coaxially. The first lens 111 has a negative focal power, the second lens 112 has a positive focal power, the third lens 113 has a negative focal power, the fourth lens 114 has a positive focal power, and the fifth lens 115 has a negative focal power.
In this embodiment, the fifth lens 115 is a non-rotationally symmetric lens, and the other lenses 11 are rotationally symmetric lenses.
According to the above relations, the design parameters of the optical lens 10 according to the seventh embodiment of the present application are as shown in table 25 below.
Table 25 design parameters of optical lens of the seventh embodiment
Figure BDA0002350671530000292
In this embodiment, the ratio R8/R7 of the image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 is 0.303, i.e., the fourth lens 114 of this embodiment is a positive meniscus structure. The image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 are negative numbers. The ratio R9/R10 of the radius of curvature R9 of the object-side surface of the fifth lens element 115 to the radius of curvature R10 of the image-side surface of the fifth lens element 115 is 1.591, i.e., the fifth lens element 115 of the present embodiment has a negative meniscus configuration. The fourth lens element 114 is a negative meniscus structure, the fifth lens element 115 is a negative meniscus structure, and the combination of the fourth lens element 114 and the fifth lens element 115 can reduce the aberration generated by the optical lens assembly 10.
The radius of curvature R4 of the image-side surface of the second lens 112, the radius of curvature R8 of the image-side surface of the fourth lens 114, and the focal length f of the optical lens 10 satisfy: (R4-R8)/f is-0.115, and R4/R8 > 0, thereby enabling the optical lens 10 of the present application to generate smaller aberrations.
Table 26 shows basic parameters of the optical lens 10 in the embodiment of the present application, as shown in table 26.
TABLE 26 basic parameters of optical lens of the seventh embodiment
f1(mm) -6.07 f4(mm) 3.249
f2(mm) 3.056 f5(mm) -25.850
f3(mm) -3.994 TTL(mm) 11.050
ImgH(mm) 5 FOV(°) 116
F value of aperture 2.235 |TDT| 2.7518％
f 3.191
As can be seen from the basic parameters of the optical lens 10, in the present embodiment, | f1/f | ═ 1.902; 0.958, | f2/f |; 1.251, | f3/f |; 1.018, | f4/f |; 8.098 | f5/f |. In the present embodiment, the focal lengths of the lenses 11 of the optical lens 10 are different, so that different lenses can play different roles, and the lenses can obtain a better imaging effect.
Referring to fig. 20, fig. 20 is a simulation diagram of the optical lens 10 of the present embodiment, in which a solid line grid is an ideal imaging grid diagram, and a grid structure formed by "X" is a schematic diagram of the optical lens 10 of the present embodiment after imaging. As is apparent from the drawing, the optical lens 10 of the present embodiment forms an image substantially the same as an ideal image, and the TV distortion in the imaging range of the optical lens 10 is small. Specifically, in the present embodiment, the maximum value TDT of TV distortion in the imaging range of the optical lens satisfies | TDT | ═ 2.7518, and the TV distortion in the imaging range of the optical lens 10 is small. In the present embodiment, the field angle FOV of the optical lens 10 is 116 °, and the F-stop value is 2.235, that is, the optical lens 10 of the present invention can realize a large field angle and a large stop, and can better satisfy the demand for image capturing. In the present embodiment, TTL is 11.050mm, ImgH is 5mm, and TTL/ImgH is 2.201, that is, the total optical length of the optical lens 10 can be small while the effective pixel area irradiated onto the photosensitive element 20 through the optical lens 10 of the present embodiment is large, so that high image quality can be obtained, the length of the optical lens 10 can be small, and the present embodiment can be applied to a thin terminal such as a mobile phone or a tablet.
Table 27 shows aspheric coefficients of the respective rotationally symmetric lenses (i.e., the second lens 112, the third lens 113, the fourth lens 114, and the fifth lens 115) of the optical lens 10 according to the present embodiment, as shown in table 27.
TABLE 27 design parameters of rotationally symmetric lenses of optical lens of seventh embodiment
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 9.1000E-02 -3.5860E-02 1.2179E-02 -2.6465E-03 3.2388E-04 -1.9987E-05 4.8469E-07
S2 1.3289E-01 -4.8217E-02 2.6150E-02 -4.5707E-03 8.8155E-04 -8.2053E-05 2.2294E-06
S3 4.9637E-02 -9.0756E-02 1.0681E-01 -9.0130E-02 4.7267E-02 -1.3657E-02 1.6444E-03
S4 -1.2347E-01 7.7947E-02 -5.3943E-02 2.9632E-02 -1.1629E-02 2.7246E-03 -2.7683E-04
S5 -1.1922E-01 3.8231E-02 -6.8224E-03 -1.6204E-04 3.0020E-04 -2.1420E-06 -6.9369E-06
S6 -5.9558E-02 2.0393E-02 -5.1403E-03 9.1120E-04 -9.2682E-05 5.5294E-06 -2.0436E-07
S7 -2.0975E-02 1.7420E-02 -6.8141E-03 1.8945E-03 -2.9405E-04 2.2953E-05 -7.0695E-07
S8 -3.4815E-02 3.1179E-03 1.4714E-03 -6.7346E-04 1.3667E-04 -1.2918E-05 4.6004E-07
The symbols a4, a6, A8, a10, a12, a14, a16, and the like represent polynomial coefficients.
The formula satisfied by substituting the above parameters into a rotationally symmetric aspheric surface:
Figure BDA0002350671530000311
in this way, the first lens 111, the second lens 112, the third lens 113 and the fourth lens 114 can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000312
table 28 shows aspheric coefficients of the non-rotationally symmetric lens (i.e., fifth lens 115) of the optical lens 10 according to the present embodiment, as shown in table 28.
Table 28 design parameters of non-rotationally symmetric lens of optical lens of seventh embodiment
Number of noodles A10 A12 A14 A21 A23 A25 A27 A36 A38 A40
S9 2.641E-02 4.754E-02 2.507E-02 -4.316E-03 -1.146E-02 -1.214E-02 -4.252E-03 4.253E-04 1.676E-03 2.360E-03
S10 -3.366E-02 -5.751E-02 -3.438E-02 7.630E-03 2.095E-02 2.223E-02 7.545E-03 -1.193E-03 -4.905E-03 -7.474E-03
Number of noodles A42 A44 A55 A57 A59 A61 A63 A65 A78 A80
S9 1.835E-03 3.929E-04 -4.032E-05 -2.172E-04 -4.310E-04 -4.160E-04 -2.195E-04 -4.168E-05 3.261E-06 1.918E-05
S10 -4.681E-03 -1.225E-03 1.301E-04 6.501E-04 1.286E-03 1.293E-03 6.765E-04 1.248E-04 -7.904E-06 -4.675E-05
Number of noodles A82 A84 A86 A88 A90 A105 A107 A109 A111 A113
S9 4.807E-05 6.674E-05 4.574E-05 2.054E-05 3.228E-06 -1.282E-07 -8.376E-07 -2.479E-06 -3.953E-06 -4.129E-06
S10 -1.177E-04 -1.572E-04 -1.150E-04 -4.958E-05 -7.762E-06 2.385E-07 1.803E-06 5.433E-06 8.974E-06 9.187E-06
Number of noodles A115 A117 A119 A136 A138 A140 A142 A144 A146 A148
S9 -2.724E-06 -6.521E-07 -1.179E-07 -1.349E-10 1.145E-08 3.256E-08 8.691E-08 7.954E-08 6.174E-08 6.582E-08
S10 5.566E-06 1.039E-06 2.774E-07 -3.939E-09 -3.488E-08 -9.554E-08 -2.076E-07 -2.514E-07 -1.790E-07 -2.038E-07
Number of noodles A150 A152
S9 -6.477E-08 1.398E-09
S10 -9.565E-09 -4.460E-09
The symbols of a10, a12, a14, a21,. …, a144, a146, a150, a152 and the like all represent polynomial coefficients.
A formula satisfied by substituting the above parameters into a free-form surface:
Figure BDA0002350671530000313
that is, the non-rotationally symmetric lens (i.e., the fifth lens 115) of the present embodiment can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000314
wherein, many not present in the tableCoefficient of the polynomial (e.g. A)1、A2Etc.) is 0.
Referring to fig. 21, fig. 21 is a schematic structural diagram of an optical lens 10 according to an eighth embodiment of the present application. In this embodiment, the optical lens 10 includes five lenses 11, which are respectively a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115, wherein the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, the fifth lens 115, and the sixth lens 16 are disposed in order from an object side to an image side, and the lenses are disposed coaxially. The first lens 111 has a negative focal power, the second lens 112 has a positive focal power, the third lens 113 has a negative focal power, the fourth lens 114 has a positive focal power, and the fifth lens 115 has a negative focal power.
In this embodiment, the fifth lens 115 is a non-rotationally symmetric lens, and the other lenses 11 are rotationally symmetric lenses.
According to the above relations, the design parameters of the optical lens 10 according to the eighth embodiment of the present application are as follows in table 29.
Table 29 design parameters of optical lens of the eighth embodiment
Figure BDA0002350671530000321
In this embodiment, a ratio R8/R7 of the image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 is 0.373, i.e., the fourth lens 114 of this embodiment is a positive meniscus structure. The image-side paraxial radius R8 and the object-side paraxial radius R7 of the fourth lens 114 are negative numbers. The ratio R9/R10 of the radius of curvature R9 of the object-side surface of the fifth lens element 115 to the radius of curvature R10 of the image-side surface of the fifth lens element 115 is 1.458, i.e., the fifth lens element 115 of the present embodiment has a negative meniscus configuration. The fourth lens element 114 is a negative meniscus structure, the fifth lens element 115 is a negative meniscus structure, and the combination of the fourth lens element 114 and the fifth lens element 115 can reduce the aberration generated by the optical lens assembly 10.
The radius of curvature R4 of the image-side surface of the second lens 112, the radius of curvature R8 of the image-side surface of the fourth lens 114, and the focal length f of the optical lens 10 satisfy: (R4-R8)/f is-0.344, and R4/R8 > 0, thereby enabling the optical lens 10 of the present application to generate smaller aberrations.
Table 30 shows basic parameters of the optical lens 10 in the embodiment of the present application, as shown in table 30.
TABLE 30 basic parameters of optical lens of the eighth embodiment
Figure BDA0002350671530000322
Figure BDA0002350671530000331
As can be seen from the basic parameters of the optical lens 10, in the present embodiment, | f1/f |, 4.100; 1.694 | f2/f |; 5.187, | f3/f |; 1.353, | f4/f |; 16.724 | f5/f |. In the present embodiment, the focal lengths of the lenses 11 of the optical lens 10 are different, so that different lenses can play different roles, and the lenses can obtain a better imaging effect.
Referring to fig. 22, fig. 22 is a simulation diagram of the optical lens 10 of the present embodiment, in which a solid line grid is an ideal imaging grid diagram, and a grid structure formed by "X" is a schematic diagram of the optical lens 10 of the present embodiment after imaging. As is apparent from the drawing, the optical lens 10 of the present embodiment forms an image substantially the same as an ideal image, and the TV distortion in the imaging range of the optical lens 10 is small. Specifically, in the present embodiment, the maximum value TDT of TV distortion in the imaging range of the optical lens satisfies | TDT | ═ 2.9275%, and the TV distortion in the imaging range of the optical lens 10 is small. In the present embodiment, the field angle FOV of the optical lens 10 is 130 °, and the F-stop value is 2.235, that is, the optical lens 10 of the present invention can realize a large field angle and a large stop, and can better satisfy the demand for image capturing. In the present embodiment, TTL is 10.855mm, ImgH is 5mm, and TTL/ImgH is 2.171, that is, the total optical length of the optical lens 10 can be small while the effective pixel area irradiated onto the photosensitive element 20 through the optical lens 10 of the present embodiment is large, so that high image quality can be obtained, the length of the optical lens 10 can be small, and the present embodiment can be applied to a thin terminal such as a mobile phone or a tablet.
Table 31 shows aspheric coefficients of the respective rotationally symmetric lenses (i.e., the second lens 112, the third lens 113, the fourth lens 114, and the fifth lens 115) of the optical lens 10 according to the present embodiment, as shown in table 31.
Table 31 design parameters of rotationally symmetric lens of optical lens system according to the eighth embodiment
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 8.0195E-03 -9.86E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00
S2 1.67E-02 -2.75E-03 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00
S3 -3.4252E-02 8.9461E-03 -4.3821E-03 1.1839E-03 -1.4928E-04 8.7812E-06 -1.9632E-07
S4 -1.3709E-02 1.9686E-02 -1.2661E-02 3.8213E-03 -6.2548E-04 5.0014E-05 -1.5156E-06
S5 -8.6453E-02 1.3465E-02 2.0485E-03 -2.0737E-03 5.3365E-04 -5.8608E-05 2.3725E-06
S6 -4.3297E-02 1.1482E-02 -2.6298E-03 4.1996E-04 -3.9488E-05 2.0398E-06 -4.6391E-08
S7 -1.4282E-02 5.6172E-03 -6.7769E-04 4.9722E-05 -2.4024E-06 6.5635E-08 -7.2186E-10
S8 -6.8773E-02 1.9442E-02 -4.3358E-03 6.3143E-04 -5.1674E-05 2.1813E-06 -3.6657E-08
The symbols a4, a6, A8, a10, a12, a14, a16, and the like represent polynomial coefficients.
The formula satisfied by substituting the above parameters into a rotationally symmetric aspheric surface:
Figure BDA0002350671530000332
in this way, the second lens 112, the third lens 113, the fourth lens 114, and the fifth lens 115 can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000341
table 32 shows aspheric coefficients of the non-rotationally symmetric lens (i.e., fifth lens 115) of the optical lens 10 of the present embodiment, as shown in table 32.
TABLE 32 design parameters of non-rotationally symmetric lens for optical lens of eighth embodiment
Number of noodles A10 A12 A14 A21 A23 A25 A27 A36 A38 A40
S9 5.921E-03 9.218E-03 7.179E-03 -6.991E-04 -2.165E-03 -1.937E-03 -6.873E-04 6.311E-07 6.278E-06 5.649E-05
S10 -3.518E-03 -8.920E-03 -3.171E-03 2.017E-04 5.227E-04 4.578E-04 4.550E-04 -3.574E-06 -1.888E-05 -3.251E-05
Number of noodles A42 A44 A55 A57 A59 A61 A63 A65 A78 A80
S9 3.227E-05 -8.019E-06 -1.237E-06 -3.653E-06 -9.327E-06 -1.020E-06 -5.299E-06 -1.071E-06 -1.939E-07 -3.664E-07
S10 -3.094E-05 5.665E-06 1.575E-07 4.477E-07 1.714E-06 1.783E-06 1.676E-07 -1.611E-06 9.645E-10 2.416E-09
Number of noodles A82 A84 A86 A88 A90 A105 A107 A109 A111 A113
S9 -9.619E-07 -2.424E-06 -2.655E-06 -1.620E-06 2.401E-08 2.995E-09 -1.852E-08 -1.384E-08 -1.716E-07 -4.439E-07
S10 7.222E-08 1.474E-07 -6.897E-08 -4.289E-07 -3.457E-08 1.145E-09 -6.132E-09 -6.209E-09 -7.982E-09 -9.439E-09
Number of noodles A115 A117 A119 A136 A138 A140 A142 A144 A146 A148
S9 -4.459E-07 5.919E-08 1.407E-09 1.378E-09 7.497E-10 2.553E-09 -1.336E-08 -5.803E-08 -1.837E-08 -9.472E-08
S10 -4.405E-08 -4.892E-08 -6.469E-10 2.122E-11 -2.364E-10 1.168E-11 1.187E-09 2.022E-09 2.378E-09 -9.093E-09
Number of noodles A150 A152
S9 -6.016E-09 -1.372E-09
S10 1.616E-09 -1.711E-11
The symbols of a10, a12, a14, a21,. …, a144, a146, a150, a152 and the like all represent polynomial coefficients.
A formula satisfied by substituting the above parameters into a free-form surface:
Figure BDA0002350671530000342
that is, the non-rotationally symmetric lens (i.e., the first lens 111) of the present embodiment can be designed. In the present embodiment, it is preferred that,
Figure BDA0002350671530000343
wherein polynomial coefficients not present in the table (e.g. A)1、A2Etc.) is 0.
In the embodiment of the present application, at least one non-rotationally symmetric lens is provided in the plurality of lenses 11 in the optical lens 10 for imaging, and the non-rotationally symmetric lens can be used to correct distortion of the optical lens 10, so that good imaging can be obtained. In addition, since the object side surface and/or the image side surface of the non-rotationally symmetric lens are/is a free-form surface, that is, the object side surface and/or the image side surface of the non-rotationally symmetric lens can have a higher design freedom, the non-rotationally symmetric lens can be designed more flexibly according to actual requirements, so as to achieve a better distortion correction effect and improve the imaging quality of the optical lens 10.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (16)

1. An optical lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from an object side to an image side, wherein the first lens, the third lens and the fifth lens all have negative focal power, and the second lens and the fourth lens all have positive focal power;
each of the first to fifth lenses includes an object side surface facing the object side and an image side surface facing the image side, the first to fifth lenses include at least one non-rotationally symmetric lens, the object side surface and/or the image side surface of the non-rotationally symmetric lens are free-form surfaces, and the optical lens satisfies the following relations:
|TDT|≤3.0％；
wherein TDT is a maximum value of TV distortion in an imaging range of the optical lens.
2. An optical lens according to claim 1, characterized in that the fourth lens is a positive meniscus lens and the fifth lens is a negative meniscus lens.
3. An optical lens according to claim 2, characterized in that the fourth lens satisfies the following relation:
0＜R8/R7<1；
wherein R7 is the curvature radius of the object side surface of the fourth lens, and R8 is the curvature radius of the image side surface of the fourth lens.
4. An optical lens according to claim 2 or 3, characterized in that the fifth lens satisfies the following relation:
1＜R9/R10≤3.5；
wherein R9 is the curvature radius of the object side surface of the fifth lens, and R10 is the curvature radius of the image side surface of the fifth lens.
5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
100°≤FOV≤130°；
wherein the FOV is the angle of view of the optical lens.
6. An optical lens according to claim 1, characterized in that the third lens satisfies the following relation:
-5.2≤f3/f≤1.5；
wherein f3 is the focal length of the third lens; f is the focal length of the optical lens in the sagittal direction.
7. An optical lens according to claim 1, wherein the second lens element and the fourth lens element satisfy the following relationship:
R4/R8＞0；
r4 is the curvature radius of the image side surface of the second lens, R8 is the curvature radius of the image side surface of the fourth lens.
8. An optical lens according to claim 1 or 7, characterized in that the second lens and the fourth lens satisfy the following relation:
-0.5≤(R4-R8)/f<0；
wherein R4 is the radius of curvature of the image-side surface of the second lens; r8 is the radius of curvature of the image-side surface of the fourth lens; f is the focal length of the optical lens.
9. An optical lens according to claim 1, characterized in that the non-rotationally symmetric lens is close to the image side of the optical lens with respect to the other lenses of the optical lens; alternatively, the non-rotationally symmetric optic is near an object side of the optical lens relative to other optics of the optical lens.
10. An optical lens according to claim 1, characterized in that the object-side surface of the non-rotationally symmetric optic is symmetric with respect to a first plane of symmetry and the object-side surface of the non-rotationally symmetric optic is symmetric with respect to a second plane of symmetry, the first plane of symmetry being perpendicular to the second plane of symmetry.
11. An optical lens according to claim 1 or 10, characterized in that the image side of the non-rotationally symmetric lens is symmetric with respect to the first plane of symmetry and the image side of the non-rotationally symmetric lens is symmetric with respect to the second plane of symmetry.
12. A camera module, comprising a photosensitive element and the optical lens of any one of claims 1 to 9, wherein the photosensitive element is located on an image side of the optical lens, and light passes through the optical lens and then is projected onto the photosensitive element.
13. The camera module of claim 12, wherein the non-rotationally symmetric optic of the optical lens is symmetric about a first plane of symmetry, and the object-side surface of the non-rotationally symmetric optic is symmetric about a second plane of symmetry, the first plane of symmetry being perpendicular to the second plane of symmetry.
14. The camera module of claim 13, wherein the non-rotationally symmetric lens has an image-side surface that is symmetric with respect to the first plane of symmetry, and the non-rotationally symmetric lens has an image-side surface that is symmetric with respect to the second plane of symmetry.
15. The camera module of claim 13 or 14, wherein the light-sensing element is rectangular, the light-sensing element comprising a first side and a second side perpendicular to each other, the first side being parallel to the first plane of symmetry, and the second side being parallel to the second plane of symmetry.
16. A terminal, comprising an image processor and a camera module according to any one of claims 12-15, the image processor being communicatively connected to the camera module, the camera module being configured to acquire image data and input the image data into the image processor, the image processor being configured to process the image data output therefrom.
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